计蒜客Java代码大全的简单介绍

计蒜客练习题：用java编写A+B+C的计算结果

将 string[] args 改成 String[] args。如果是初学Java，记住，Java 标准使用驼峰命令法，所有类名的首字母都是大写。好好加油，刚开始学大家都会犯这些错误

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需求50句以上的JAVA代码，并带注解

Java文件操作大全

1.创建文件夹

//import java.io.*;

File myFolderPath = new File(%%1);

try {

if (!myFolderPath.exists()) {

myFolderPath.mkdir();

}

}

catch (Exception e) {

System.out.println("新建目录操作出错");

e.printStackTrace();

}

2.创建文件

//import java.io.*;

File myFilePath = new File(%%1);

try {

if (!myFilePath.exists()) {

myFilePath.createNewFile();

}

FileWriter resultFile = new FileWriter(myFilePath);

PrintWriter myFile = new PrintWriter(resultFile);

myFile.println(%%2);

resultFile.close();

}

catch (Exception e) {

System.out.println("新建文件操作出错");

e.printStackTrace();

}

3.删除文件

//import java.io.*;

File myDelFile = new File(%%1);

try {

myDelFile.delete();

}

catch (Exception e) {

System.out.println("删除文件操作出错");

e.printStackTrace();

}

4.删除文件夹

//import java.io.*;

File delFolderPath = new File(%%1);

try {

delFolderPath.delete(); //删除空文件夹

}

catch (Exception e) {

System.out.println("删除文件夹操作出错");

e.printStackTrace();

}

5.删除一个文件下夹所有的文件夹

//import java.io.*;

File delfile=new File(%%1);

File[] files=delfile.listFiles();

for(int i=0;ifiles.length;i++){

if(files[i].isDirectory()){

files[i].delete();

}

}

6.清空文件夹

//import java.io.*;

File delfilefolder=new File(%%1);

try {

if (!delfilefolder.exists()) {

delfilefolder.delete();

}

delfilefolder.mkdir();

}

catch (Exception e) {

System.out.println("清空目录操作出错");

e.printStackTrace();

}

7.读取文件

//import java.io.*;

// 逐行读取数据

FileReader fr = new FileReader(%%1);

BufferedReader br = new BufferedReader(fr);

String %%2 = br.readLine();

while (%%2 != null) {

%%3

%%2 = br.readLine();

}

br.close();

fr.close();

8.写入文件

//import java.io.*;

// 将数据写入文件

try {

FileWriter fw = new FileWriter(%%1);

fw.write(%%2);

fw.flush();

fw.close();

} catch (IOException e) {

e.printStackTrace();

}

9.写入随机文件

//import java.io.*;

try {

RandomAcessFile logFile=new RandomAcessFile(%%1,"rw");

long lg=logFile.length();

logFile.seek(%%2);

logFile.writeByte(%%3);

}catch(IOException ioe){

System.out.println("无法写入文件："+ioe.getMessage());

}

10.读取文件属性

//import java.io.*;

// 文件属性的取得

File af = new File(%%1);

if (af.exists()) {

System.out.println(f.getName() + "的属性如下： 文件长度为：" + f.length());

System.out.println(f.isFile() ? "是文件" : "不是文件");

System.out.println(f.isDirectory() ? "是目录" : "不是目录");

System.out.println(f.canRead() ? "可读取" : "不");

System.out.println(f.canWrite() ? "是隐藏文件" : "");

System.out.println("文件夹的最后修改日期为：" + new Date(f.lastModified()));

} else {

System.out.println(f.getName() + "的属性如下：");

System.out.println(f.isFile() ? "是文件" : "不是文件");

System.out.println(f.isDirectory() ? "是目录" : "不是目录");

System.out.println(f.canRead() ? "可读取" : "不");

System.out.println(f.canWrite() ? "是隐藏文件" : "");

System.out.println("文件的最后修改日期为：" + new Date(f.lastModified()));

}

if(f.canRead()){

%%2

}

if(f.canWrite()){

%%3

}

11.写入属性

//import java.io.*;

File filereadonly=new File(%%1);

try {

boolean b=filereadonly.setReadOnly();

}

catch (Exception e) {

System.out.println("拒绝写访问："+e.printStackTrace());

}

12.枚举一个文件夹中的所有文件

//import java.io.*;

//import java.util.*;

LinkedListString folderList = new LinkedListString();

folderList.add(%%1);

while (folderList.size() 0) {

File file = new File(folderList.peek());

folderList.removeLast();

File[] files = file.listFiles();

ArrayListFile fileList = new ArrayListFile();

for (int i = 0; i files.length; i++) {

if (files[i].isDirectory()) {

folderList.add(files[i].getPath());

} else {

fileList.add(files[i]);

}

}

for (File f : fileList) {

%%2=f.getAbsoluteFile();

%%3

}

}

13.复制文件夹

//import java.io.*;

//import java.util.*;

LinkedListString folderList = new LinkedListString();

folderList.add(%%1);

LinkedListString folderList2 = new LinkedListString();

folderList2.add(%%2+ %%1.substring(%%1.lastIndexOf("\\")));

while (folderList.size() 0) {

(new File(folderList2.peek())).mkdirs(); // 如果文件夹不存在 则建立新文件夹

File folders = new File(folderList.peek());

String[] file = folders.list();

File temp = null;

try {

for (int i = 0; i file.length; i++) {

if (folderList.peek().endsWith(File.separator)) {

temp = new File(folderList.peek() + File.separator

+ file[i]);

} else {

temp = new File(folderList.peek() + File.separator

+ file[i]);

}

if (temp.isFile()) {

FileInputStream input = new FileInputStream(temp);

FileOutputStream output = new FileOutputStream(

folderList2.peek() + File.separator

+ (temp.getName()).toString());

byte[] b = new byte[5120];

int len;

while ((len = input.read(b)) != -1) {

output.write(b, 0, len);

}

output.flush();

output.close();

input.close();

}

if (temp.isDirectory()) {// 如果是子文件夹

for (File f : temp.listFiles()) {

if (f.isDirectory()) {

folderList.add(f.getPath());

folderList2.add(folderList2.peek()

+ File.separator + f.getName());

}

}

}

}

} catch (Exception e) {

//System.out.println("复制整个文件夹内容操作出错");

e.printStackTrace();

}

folderList.removeFirst();

folderList2.removeFirst();

}

14.复制一个文件夹下所有的文件夹到另一个文件夹下

//import java.io.*;

//import java.util.*;

File copyfolders=new File(%%1);

File[] copyfoldersList=copyfolders.listFiles();

for(int k=0;kcopyfoldersList.length;k++){

if(copyfoldersList[k].isDirectory()){

ArrayListStringfolderList=new ArrayListString();

folderList.add(copyfoldersList[k].getPath());

ArrayListStringfolderList2=new ArrayListString();

folderList2.add(%%2+"/"+copyfoldersList[k].getName());

for(int j=0;jfolderList.length;j++){

(new File(folderList2.get(j))).mkdirs(); //如果文件夹不存在 则建立新文件夹

File folders=new File(folderList.get(j));

String[] file=folders.list();

File temp=null;

try {

for (int i = 0; i file.length; i++) {

if(folderList.get(j).endsWith(File.separator)){

temp=new File(folderList.get(j)+"/"+file[i]);

}

else{

temp=new File(folderList.get(j)+"/"+File.separator+file[i]);

}

FileInputStream input = new FileInputStream(temp);

if(temp.isFile()){

FileInputStream input = new FileInputStream(temp);

FileOutputStream output = new FileOutputStream(folderList2.get(j) + "/" +

(temp.getName()).toString());

byte[] b = new byte[5120];

int len;

while ( (len = input.read(b)) != -1) {

output.write(b, 0, len);

}

output.flush();

output.close();

input.close();

}

if(temp.isDirectory()){//如果是子文件夹

folderList.add(folderList.get(j)+"/"+file[i]);

folderList2.add(folderList2.get(j)+"/"+file[i]);

}

}

}

catch (Exception e) {

System.out.println("复制整个文件夹内容操作出错");

e.printStackTrace();

}

}

}

}

15.移动文件夹

//import java.io.*;

//import java.util.*;

LinkedListString folderList = new LinkedListString();

folderList.add(%%1);

LinkedListString folderList2 = new LinkedListString();

folderList2.add(%%2 + %%1.substring(%%1.lastIndexOf("\\")));

while (folderList.size() 0) {

(new File(folderList2.peek())).mkdirs(); // 如果文件夹不存在 则建立新文件夹

File folders = new File(folderList.peek());

String[] file = folders.list();

File temp = null;

try {

for (int i = 0; i file.length; i++) {

if (folderList.peek().endsWith(File.separator)) {

temp = new File(folderList.peek() + File.separator

+ file[i]);

} else {

temp = new File(folderList.peek() + File.separator

+ file[i]);

}

if (temp.isFile()) {

FileInputStream input = new FileInputStream(temp);

FileOutputStream output = new FileOutputStream(

folderList2.peek() + File.separator

+ (temp.getName()).toString());

byte[] b = new byte[5120];

int len;

while ((len = input.read(b)) != -1) {

output.write(b, 0, len);

}

output.flush();

output.close();

input.close();

if (!temp.delete())

System.out.println("删除单个文件操作出错!");

}

if (temp.isDirectory()) {// 如果是子文件夹

for (File f : temp.listFiles()) {

if (f.isDirectory()) {

folderList.add(f.getPath());

folderList2.add(folderList2.peek()

+ File.separator + f.getName());

}

}

}

}

} catch (Exception e) {

// System.out.println("复制整个文件夹内容操作出错");

e.printStackTrace();

}

folderList.removeFirst();

folderList2.removeFirst();

}

File f = new File(%%1);

if (!f.delete()) {

for (File file : f.listFiles()) {

if (file.list().length == 0) {

System.out.println(file.getPath());

file.delete();

}

}

}

16.移动一个文件夹下所有的文件夹到另一个目录下

//import java.io.*;

//import java.util.*;

File movefolders=new File(%%1);

File[] movefoldersList=movefolders.listFiles();

for(int k=0;kmovefoldersList.length;k++){

if(movefoldersList[k].isDirectory()){

ArrayListStringfolderList=new ArrayListString();

folderList.add(movefoldersList[k].getPath());

ArrayListStringfolderList2=new ArrayListString();

folderList2.add(%%2+"/"+movefoldersList[k].getName());

for(int j=0;jfolderList.length;j++){

(new File(folderList2.get(j))).mkdirs(); //如果文件夹不存在 则建立新文件夹

File folders=new File(folderList.get(j));

String[] file=folders.list();

File temp=null;

try {

for (int i = 0; i file.length; i++) {

if(folderList.get(j).endsWith(File.separator)){

temp=new File(folderList.get(j)+"/"+file[i]);

}

else{

temp=new File(folderList.get(j)+"/"+File.separator+file[i]);

}

FileInputStream input = new FileInputStream(temp);

if(temp.isFile()){

FileInputStream input = new FileInputStream(temp);

FileOutputStream output = new FileOutputStream(folderList2.get(j) + "/" +

(temp.getName()).toString());

byte[] b = new byte[5120];

int len;

while ( (len = input.read(b)) != -1) {

output.write(b, 0, len);

}

output.flush();

output.close();

input.close();

temp.delete();

}

if(temp.isDirectory()){//如果是子文件夹

folderList.add(folderList.get(j)+"/"+file[i]);

folderList2.add(folderList2.get(j)+"/"+file[i]);

}

}

}

catch (Exception e) {

System.out.println("复制整个文件夹内容操作出错");

e.printStackTrace();

}

}

movefoldersList[k].delete();

}

}

17.以一个文件夹的框架在另一个目录创建文件夹和空文件

//import java.io.*;

//import java.util.*;

boolean b=false;//不创建空文件

ArrayListStringfolderList=new ArrayListString();

folderList.add(%%1);

ArrayListStringfolderList2=new ArrayListString();

folderList2.add(%%2);

for(int j=0;jfolderList.length;j++){

(new File(folderList2.get(j))).mkdirs(); //如果文件夹不存在 则建立新文件夹

File folders=new File(folderList.get(j));

String[] file=folders.list();

File temp=null;

try {

for (int i = 0; i file.length; i++) {

if(folderList.get(j).endsWith(File.separator)){

temp=new File(folderList.get(j)+"/"+file[i]);

}

else{

temp=new File(folderList.get(j)+"/"+File.separator+file[i]);

}

FileInputStream input = new FileInputStream(temp);

if(temp.isFile()){

if (b) temp.createNewFile();

}

if(temp.isDirectory()){//如果是子文件夹

folderList.add(folderList.get(j)+"/"+file[i]);

folderList2.add(folderList2.get(j)+"/"+file[i]);

}

}

}

catch (Exception e) {

System.out.println("复制整个文件夹内容操作出错");

e.printStackTrace();

}

}

18.复制文件

//import java.io.*;

int bytesum = 0;

int byteread = 0;

File oldfile = new File(%%1);

try {

if (oldfile.exists()) { //文件存在时

FileInputStream inStream = new FileInputStream(oldfile); //读入原文件

FileOutputStream fs = new FileOutputStream(new File(%%2,oldfile.getName()));

byte[] buffer = new byte[5120];

int length;

while ( (byteread = inStream.read(buffer)) != -1) {

bytesum += byteread; //字节数 文件大小

System.out.println(bytesum);

fs.write(buffer, 0, byteread);

}

inStream.close();

}

}

catch (Exception e) {

System.out.println("复制单个文件操作出错");

e.printStackTrace();

}

19.复制一个文件夹下所有的文件到另一个目录

//import java.io.*;

File copyfiles=new File(%%1);

File[] files=copyfiles.listFiles();

for(int i=0;ifiles.length;i++){

if(!files[i].isDirectory()){

int bytesum = 0;

int byteread = 0;

try {

InputStream inStream = new FileInputStream(files[i]); //读入原文件

FileOutputStream fs = new FileOutputStream(new File(%%2,files[i].getName());

byte[] buffer = new byte[5120];

int length;

while ( (byteread = inStream.read(buffer)) != -1) {

bytesum += byteread; //字节数 文件大小

System.out.println(bytesum);

fs.write(buffer, 0, byteread);

}

inStream.close();

} catch (Exception e) {

System.out.println("复制单个文件操作出错");

e.printStackTrace();

}

}

}

20.提取扩展名

String %%2=%%1.substring(%%1.lastIndexOf(".")+1);

要用java编的计算器代码

给你一个比较简单的吧。以前写的。

共两个类。还只是完成＋、－、×、÷运算而已。

GUI只是用了AWT，很简单，相信一看就能懂了。

Calculator.java

public class Calculator{

private String result = "0";

private int op = 0,add = 1,sub = 2,mul = 3,div = 4;

private double stringToDouble(String x){

double y = Double.parseDouble(x);

return y;

}

private void operate(String x){

double x1 = stringToDouble(x);

double y = stringToDouble(result);

switch (op){

case 0:

result = x;

break;

case 1:

result = String.valueOf(y+x1);

break;

case 2:

result = String.valueOf(y-x1);

break;

case 3:

result = String.valueOf(y*x1);

break;

case 4:

if(x1!=0){

result = String.valueOf(y/x1);

}else{

result = "The divisor can't be zero!";

}

break;

}

}

public String opAdd(String x){

operate(x);

op = add;

return result;

}

public String opSubtract(String x){

operate(x);

op = sub;

return result;

}

public String opMultiply(String x){

operate(x);

op = mul;

return result;

}

public String opDivide(String x){

operate(x);

op = div;

return result;

}

public String opEquals(String x){

operate(x);

op = 0;

return result;

}

public void opClean(){

op = 0;

result = "0";

}

}

CalculatorGUI.java

import java.awt.*;

import java.awt.event.*;

import java.util.EventObject;

public class CalculatorGUI{

private Frame f;

private Panel p1,p2;

private Button b0,b1,b2,b3,b4,b5,b6,b7,b8,b9;

private Button bPoint,bAdd,bDec,bMul,bDiv,bCal;

private TextField tf;

private String s,op;

private Calculator cal = new Calculator();

private boolean ifOp;

public CalculatorGUI(){

f = new Frame("Calculator");

p1 = new Panel();

p2 = new Panel();

b0 = new Button("0");

b1 = new Button("1");

b2 = new Button("2");

b3 = new Button("3");

b4 = new Button("4");

b5 = new Button("5");

b6 = new Button("6");

b7 = new Button("7");

b8 = new Button("8");

b9 = new Button("9");

bPoint = new Button(".");

bAdd = new Button("+");

bDec = new Button("-");

bMul = new Button("*");

bDiv = new Button("/");

bCal = new Button("=");

tf = new TextField(25);

tf.setEditable(false);

}

public void launchFrame(){

f.setSize(220,160);

f.setResizable(false);

f.addWindowListener(new myWindowListener());

p1.setLayout(new FlowLayout(FlowLayout.CENTER));

p1.add(tf);

f.add(p1,BorderLayout.NORTH);

p2.setLayout(new GridLayout(4,4));

b0.addActionListener(new setLabelText_ActionListener());

b1.addActionListener(new setLabelText_ActionListener());

b2.addActionListener(new setLabelText_ActionListener());

b3.addActionListener(new setLabelText_ActionListener());

b4.addActionListener(new setLabelText_ActionListener());

b5.addActionListener(new setLabelText_ActionListener());

b6.addActionListener(new setLabelText_ActionListener());

b7.addActionListener(new setLabelText_ActionListener());

b8.addActionListener(new setLabelText_ActionListener());

b9.addActionListener(new setLabelText_ActionListener());

bPoint.addActionListener(new setLabelText_ActionListener());

bAdd.addActionListener(new setOperator_ActionListener());

bDec.addActionListener(new setOperator_ActionListener());

bMul.addActionListener(new setOperator_ActionListener());

bDiv.addActionListener(new setOperator_ActionListener());

bCal.addActionListener(new setOperator_ActionListener());

p2.add(b7);

p2.add(b8);

p2.add(b9);

p2.add(bAdd);

p2.add(b4);

p2.add(b5);

p2.add(b6);

p2.add(bDec);

p2.add(b1);

p2.add(b2);

p2.add(b3);

p2.add(bMul);

p2.add(b0);

p2.add(bPoint);

p2.add(bCal);

p2.add(bDiv);

f.add(p2,BorderLayout.SOUTH);

f.setVisible(true);

}

public void setTextFieldText_Temp(){

if (tf.getText().length()15 (tf.getText().indexOf(".")==-1 || !s.equals("."))){

tf.setText(tf.getText()+s);

}else{

tf.setText((tf.getText()+s).substring(0,15));

}

}

public void setTextFieldText(){

if(ifOp){

ifOp = false;

tf.setText("");

setTextFieldText_Temp();

}else{

setTextFieldText_Temp();

}

}

public static void main(String[] args){

CalculatorGUI calculator = new CalculatorGUI();

calculator.launchFrame();

}

class myWindowListener extends WindowAdapter{

public void windowClosing(WindowEvent e){

System.exit(0);

}

}

class setLabelText_ActionListener implements ActionListener{

public void actionPerformed(ActionEvent e){

Button tempB = (Button)e.getSource();

s = tempB.getLabel();

setTextFieldText();

}

}

class setOperator_ActionListener implements ActionListener{

public void actionPerformed(ActionEvent e){

Button tempB = (Button)e.getSource();

op = tempB.getLabel();

if(op.equals("+")){

tf.setText(cal.opAdd(tf.getText()));

ifOp = true;

}else if(op.equals("-")){

tf.setText(cal.opSubtract(tf.getText()));

ifOp = true;

}else if(op.equals("*")){

tf.setText(cal.opMultiply(tf.getText()));

ifOp = true;

}else if(op.equals("/")){

tf.setText(cal.opDivide(tf.getText()));

ifOp = true;

}else if(op.equals("=")){

tf.setText(cal.opEquals(tf.getText()));

ifOp = true;

}

}

}

}

计蒜客 T1071 计分程序题目，求java解答！

可以使用递归，我就写一个static方法剩下的语句你应该会写

public static int sum(int num)

{int k=0;

if(num=10)k=6;

else if(num10num=20)k=2;

else if(num20num40)k=1;

if(num=40)return 100;

else if(num==1)return 6;//*设定边界值1和40**//

else return sum(n-1)+k;

}

给段最简单的java代码 让我新手看一下

最简单的java代码肯定就是这个了，如下：

public class MyFirstApp

{

public static void main(String[] args)

{

System.out.print("Hello world");

}

}

“hello world”就是应该是所有学java的新手看的第一个代码了。如果是零基础的新手朋友们可以来我们的java实验班试听，有免费的试听课程帮助学习java必备基础知识，有助教老师为零基础的人提供个人学习方案，学习完成后有考评团进行专业测试，帮助测评学员是否适合继续学习java，15天内免费帮助来报名体验实验班的新手快速入门java，更好的学习java！

JAVA计算器代码

import java.awt.*;

import java.applet.*;

public class CalculatorDemo extends Applet

{

TextField answerText;

Button pointButton,equalButton,plusButton;

Button minusButton,clearButton,multiButton,divisionButton;

Button[] b=new Button[10];

String currentOp,preOp;

String foreText,backText;

boolean isFloat=false;

public void init()

{

Panel p1=new Panel();

Panel p2=new Panel();

Panel p3=new Panel();

currentOp=new String("");

preOp=new String("");

foreText=new String("");

backText=new String("");

answerText=new TextField(8);

setBackground(Color.lightGray);

setForeground(Color.blue);

for(int i=9;i=0;i--)

{

b[i]=new Button(Integer.toString(i));

p2.add(b[i]);

}

pointButton=new Button(".");

equalButton=new Button("=");

equalButton.setForeground(Color.red);

clearButton=new Button("清除");

clearButton.setForeground(Color.red);

divisionButton=new Button("/");

divisionButton.setForeground(Color.red);

multiButton=new Button("*");

multiButton.setForeground(Color.red);

minusButton=new Button("-");

minusButton.setForeground(Color.red);

plusButton=new Button("+");

plusButton.setForeground(Color.red);

setLayout(new FlowLayout());

p1.setLayout(new FlowLayout());

p2.setLayout(new GridLayout(4,3));

p3.setLayout(new GridLayout(4,1));

p1.add(answerText);

p1.add(clearButton);

p2.add(pointButton);

p2.add(equalButton);

p3.add(plusButton);

p3.add(minusButton);

p3.add(multiButton);

p3.add(divisionButton);

add(p1);

add(p2);

add(p3);

}

public boolean action(Event e,Object o)

{

String s=new String("");

for(int i=0;i10;i++)

{

if(e.target==b[i]||e.target==pointButton)

{

if(e.target !=pointButton)

{

s=(String)o;

doForeText(s);

}

if((e.target==pointButton)(!isFloat))

{

isFloat=true;

s=(String)o;

if(foreText.equals(""))

{

foreText +="0.";

}

else

{

doForeText(s);

}

}

}

}

if(e.target==clearButton)

{

doClear();

}

if((e.target==clearButton)||(e.target==divisionButton)

||(e.target==plusButton)||(e.target==minusButton))

{

if(foreText !="")

{

currentOp=((String)o);

doOperator();

}

else

{

preOp=((String)o);

}

}

if(e.target==equalButton)

{

doOperator();

}

return true;

}

public void doOperator()

{

double dFore,dBack;

Double d;

if(preOp.equals(""))

{

backText=foreText;

foreText="";

answerText.setText(backText);

}

else

{

dFore=(new Double(foreText)).doubleValue();

dBack=(new Double(backText)).doubleValue();

foreText="";

backText=answerText.getText();

if(preOp.equals("+"))

{

d=new Double((dBack+dFore));

answerText.setText(d.toString());

backText=d.toString();

}

if(preOp.equals("-"))

{

d=new Double((dBack-dFore));

answerText.setText(d.toString());

backText=d.toString();

}

if(preOp.equals("*"))

{

d=new Double((dBack*dFore));

answerText.setText(d.toString());

backText=d.toString();

}

if(preOp.equals("/"))

{

if(dFore==0)

{

answerText.setText("除数不能为0");

return;

}

d=new Double((dBack/dFore));

answerText.setText(d.toString());

backText=d.toString();

}

}

preOp=currentOp;

}

public void doForeText(String s)

{

foreText +=s;

answerText.setText(foreText);

}

public void doBackText(String s)

{

backText=foreText;

foreText="";

answerText.setText(foreText);

}

public void doClear()

{

currentOp="";

preOp="";

foreText="";

backText="";

isFloat=false;

answerText.setText("");

}

}