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import java.awt.*;
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import java.awt.event.*;
import javax.swing.*;
class ConstructFrame extends JFrame
{
private static final long serialVersionUID = 1L;
String value1="",result,value2="";
int flag=0,fix=0,sum=1;
Boolean happy;
JTextField text=new JTextField(30);
int flagsum=0;
Container c=getContentPane();
JButton buttonx;
ConstructFrame()
{ super("计算器");
c.setLayout(null);
c.setBackground(Color.blue);
this.setSize(400, 400);
c.add(text);
text.setHorizontalAlignment(JTextField.RIGHT);
final JButton buttonx=new JButton("BackSpace");
c.add(buttonx);
buttonx.addMouseListener(new MouseAdapter()
{
public void mousePressed(MouseEvent e)
{
int count=0;
String temp;
if(flag==0)
{
count=value1.length();
if(count!=1)
temp=value1.substring(0, count-1);
else
temp="0";
value1=temp;
}
else
{
count=value2.length();
if(count!=1)
temp=value2.substring(0, count-1);
else
temp="0";
value2=temp;
}
text.setText(temp);
}
});
final JButton buttony=new JButton("CE");
c.add(buttony);
buttony.addMouseListener(new MouseAdapter()
{
public void mousePressed(MouseEvent e)
{
value1="";
value2="";
flag=0;
text.setText("0");
}
});
final JButton button1=new JButton("1");
c.add(button1);
button1.addMouseListener(new MouseAdapter()
{
public void mousePressed(MouseEvent e)
{
String temp;
if(flag==0)
{
value1=value1+1;
temp=value1;
}
else
{
value2=value2+1;
temp=value2;
}
text.setText(temp);
}
});
final JButton button2=new JButton(" 2 ");
c.add(button2);
button2.addMouseListener(new MouseAdapter()
{
public void mousePressed(MouseEvent e)
{
String temp;
if(flag==0)
{
value1=value1+2;
temp=value1;
}
else
{
value2=value2+2;
temp=value2;
}
text.setText(temp);
}
});
final JButton button3=new JButton("3");
c.add(button3);
button3.addMouseListener(new MouseAdapter()
{
public void mousePressed(MouseEvent e)
{
String temp;
if(flag==0)
{
value1=value1+3;
temp=value1;
}
else
{
value2=value2+3;
temp=value2;
}
text.setText(temp);
}
});
final JButton button4=new JButton("4");
c.add(button4);
button4.addMouseListener(new MouseAdapter()
{
public void mousePressed(MouseEvent e)
{
String temp;
if(flag==0)
{
value1=value1+4;
temp=value1;
}
else
{
value2=value2+4;
temp=value2;
}
text.setText(temp);
}
});
final JButton button5=new JButton("5");
c.add(button5);
button5.addMouseListener(new MouseAdapter()
{
public void mousePressed(MouseEvent e)
{
String temp;
if(flag==0)
{
value1=value1+5;
temp=value1;
}
else
{
value2=value2+5;
temp=value2;
}
text.setText(temp);
}
});
final JButton button6=new JButton("6");
c.add(button6);
button6.addMouseListener(new MouseAdapter()
{
public void mousePressed(MouseEvent e)
{
String temp;
if(flag==0)
{
value1=value1+6;
temp=value1;
}
else
{
value2=value2+6;
temp=value2;
}
text.setText(temp);
}
});
final JButton button7=new JButton("7");
c.add(button7);
button7.addMouseListener(new MouseAdapter()
{
public void mousePressed(MouseEvent e)
{
String temp;
if(flag==0)
{
value1=value1+7;
temp=value1;
}
else
{
value2=value2+7;
temp=value2;
}
text.setText(temp);
}
});
final JButton button8=new JButton("8");
c.add(button8);
button8.addMouseListener(new MouseAdapter()
{
public void mousePressed(MouseEvent e)
{
String temp;
if(flag==0)
{
value1=value1+8;
temp=value1;
}
else
{
value2=value2+8;
temp=value2;
}
text.setText(temp);
}
});
final JButton button9=new JButton("9");
c.add(button9);
button9.addMouseListener(new MouseAdapter()
{
public void mousePressed(MouseEvent e)
{
String temp;
if(flag==0)
{
value1=value1+9;
temp=value1;
}
else
{
value2=value2+9;
temp=value2;
}
text.setText(temp);
}
});
final JButton button0=new JButton("0");
c.add(button0);
button0.addMouseListener(new MouseAdapter()
{
public void mousePressed(MouseEvent e)
{
String temp;
if(flag==0)
{
value1=value1+0;
temp=value1;
}
else
{
value2=value2+0;
temp=value2;
}
text.setText(temp);
}
});
final JButton buttonadd=new JButton(" + ");
c.add(buttonadd);
buttonadd.addMouseListener(new MouseAdapter()
{
public void mousePressed(MouseEvent e)
{
flag=1;
fix=1;
flagsum=0;
}
});
final JButton buttonsubtract=new JButton(" - ");
c.add(buttonsubtract);
buttonsubtract.addMouseListener(new MouseAdapter()
{
public void mousePressed(MouseEvent e)
{
flag=1;
fix=2;
flagsum=0;
}
});
final JButton buttoncheng=new JButton(" * ");
c.add(buttoncheng);
buttoncheng.addMouseListener(new MouseAdapter()
{
public void mousePressed(MouseEvent e)
{
flag=1;
fix=3;
flagsum=0;
}
});
final JButton buttonchu=new JButton(" / ");
c.add(buttonchu);
buttonchu.addMouseListener(new MouseAdapter()
{
public void mousePressed(MouseEvent e)
{
flag=1;
flagsum=0;
fix=4;
}
});
final JButton buttonequal=new JButton(" = ");
c.add(buttonequal);
buttonequal.addMouseListener(new MouseAdapter()
{
public void mousePressed(MouseEvent e)
{
double temp1,temp2;
double temp=0;
flagsum=0;
temp1=Double.parseDouble(value1);
temp2=Double.parseDouble(value2);
flag=0;
switch(fix)
{
case 1: temp=temp1+temp2;break;
case 2: temp=temp1-temp2;break;
case 3: temp=temp1*temp2;break;
case 4: temp=temp1/temp2;break;
}
result=Double.valueOf(temp).toString();
value1=result;
value2="";
flag=1;
text.setText(result);
}
});
final JButton buttonpoint=new JButton(".");
c.add(buttonpoint);
buttonpoint.addMouseListener(new MouseAdapter()
{
public void mousePressed(MouseEvent e)
{ if(flagsum==0)
{
String temp;
if(flag==0 )
{
value1=value1+".";
temp=value1;
}
else
{
value2=value2+".";
temp=value2;
}
flagsum=1;
text.setText(temp);
}
}
});
JButton buttonz=new JButton("Start");
c.add(buttonz);
buttonz.addMouseListener(new MouseAdapter()
{
public void mousePressed(MouseEvent e)
{ if(sum%2==1)
{
happy=true;
text.setText("0.");
flag=0;
}
else
{
happy=false;
value1="";
value2="";
text.setText("");
}
text.setEnabled(happy);
button1.setEnabled(happy);
button2.setEnabled(happy);
button3.setEnabled(happy);
button4.setEnabled(happy);
button5.setEnabled(happy);
button6.setEnabled(happy);
button7.setEnabled(happy);
button8.setEnabled(happy);
button9.setEnabled(happy);
button0.setEnabled(happy);
buttonx.setEnabled(happy);
buttony.setEnabled(happy);
buttonadd.setEnabled(happy);
buttonsubtract.setEnabled(happy);
buttonpoint.setEnabled(happy);
buttonequal.setEnabled(happy);
buttoncheng.setEnabled(happy);
buttonchu.setEnabled(happy);
sum++;
}
});
button1.setEnabled(false);
button2.setEnabled(false);
button3.setEnabled(false);
button4.setEnabled(false);
button5.setEnabled(false);
button6.setEnabled(false);
button7.setEnabled(false);
button8.setEnabled(false);
button9.setEnabled(false);
button0.setEnabled(false);
buttonx.setEnabled(false);
buttony.setEnabled(false);
buttonadd.setEnabled(false);
buttonsubtract.setEnabled(false);
buttonpoint.setEnabled(false);
buttonequal.setEnabled(false);
buttoncheng.setEnabled(false);
buttonchu.setEnabled(false);
text.setEnabled(false);
text.setBounds(20, 20, 200, 40);
buttonx.setBounds(20, 60,100, 40);
buttony.setBounds(140, 60,100, 40);
buttonz.setBounds(260, 60,80, 40);
button1.setBounds(20, 120,60, 40);
button2.setBounds(100, 120,60, 40);
button3.setBounds(180, 120,60, 40);
buttonadd.setBounds(260, 120,60, 40);
button4.setBounds(20, 180,60, 40);
button5.setBounds(100, 180,60, 40);
button6.setBounds(180, 180,60, 40);
buttonsubtract.setBounds(260, 180,60, 40);
button7.setBounds(20, 240,60, 40);
button8.setBounds(100, 240,60, 40);
button9.setBounds(180, 240,60, 40);
buttoncheng.setBounds(260,240,60,40);
button0.setBounds(20, 300,60, 40);
buttonpoint.setBounds(100, 300, 60, 40);
buttonequal.setBounds(180,300,60, 40);
buttonchu.setBounds(260, 300,60, 40);
setVisible(true);
}
class MYMouseEvent extends MouseAdapter
{
public void mousePressed(MouseEvent e)
{
value1=e.toString();
text.setText(value1);
}
}
}
class Calutator
{
public static void main(String[] args)
{
new ConstructFrame();
}
}
你自己慢慢的看吧！
第一种
package com.at.java;
class PIThread extends Thread{
public void run(){
double num=1,PI=0;int i=0;
while(num0.001) {
num=(double)4/(2*i+++1);
if(i%2==0)PI-=num;
else PI+=num;
System.out.println("派的数值为"+PI);
if(num=0.001)System.out.println("××××××××××派的数值计算已经结束××××××××××");
}
}
}
class EThread extends Thread{
public void run(){
double num=1,E=0;int i=1;
while(1/num0.00000001) {
num=num*i++;
E+=1/num;
System.out.println("自然对数E的数值为"+E);
if(1/num=0.00000001)System.out.println("××××××××××自然对数的数值计算已经结束××××××××××");
}
}
}
public class JustTest {
public static void main(String args[]) {
PIThread p=new PIThread();
EThread e=new EThread();
p.start();
e.start();
int sum=0;
for(int i=1;i1001;i++)
{
sum+=i;
System.out.println(sum);
}
System.out.println("×××××××××××××自动求和1到1000已经结束××××××××××××××××");
}
}
第二种
package com.at.java;
class PIThread implements Runnable{
public void run(){
double num=1,PI=0;int i=0;
while(num0.001) {
num=(double)4/(2*i+++1);
if(i%2==0)PI-=num;
else PI+=num;
System.out.println("派的数值为"+PI);
if(num=0.001)System.out.println("××××××××××派的数值计算已经结束××××××××××");
}
}
}
class EThread implements Runnable{
public void run(){
double num=1,E=0;int i=1;
while(1/num0.00000001) {
num=num*i++;
E+=1/num;
System.out.println("自然对数E的数值为"+E);
if(1/num=0.00000001)System.out.println("××××××××××自然对数的数值计算已经结束××××××××××");
}
}
}
public class JustTest {
public static void main(String args[]) {
PIThread p=new PIThread();
EThread e=new EThread();
Thread t1=new Thread(p);
Thread t2=new Thread(e);
t1.start();
t2.start();
int sum=0;
for(int i=1;i1001;i++)
{
sum+=i;
System.out.println(sum);
}
System.out.println("×××××××××××××自动求和1到1000已经结束××××××××××××××××");
}
}
都已经验证过，正常运行
你安装JDK的目录下，有个src.zip文件，这个就是JDK源代码的java文件。
你可以解压来查看，但，最好是关联到IDE如 eclipse 中（不需解压），然后 CTRL + 点击就可以查看到源代码了。
如下图：
package com.io2.homework;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;
/*压缩文件夹*/
public class MyMultipleFileZip
{
private String currentZipFilePath = "F:/MyZip.zip";
private String sourceFilePath;
private ZipOutputStream zos;
private FileInputStream fis;
public MyMultipleFileZip(String sourceFilePath)
{
try
{
this.sourceFilePath = sourceFilePath;
zos = new ZipOutputStream(new FileOutputStream(currentZipFilePath));
//设定文件压缩级别
zos.setLevel(9);
} catch (FileNotFoundException e)
{
e.printStackTrace();
}
}
// 在当前条目中写入具体内容
public void writeToEntryZip(String filePath)
{
try
{
fis = new FileInputStream(filePath);
} catch (FileNotFoundException e1)
{
e1.printStackTrace();
}
byte[] buff = new byte[1024];
int len = 0;
try
{
while ((len = fis.read(buff)) != -1)
{
zos.write(buff, 0, len);
}
} catch (IOException e)
{
e.printStackTrace();
}finally
{
if (fis != null)
try
{
fis.close();
} catch (IOException e)
{
e.printStackTrace();
}
}
}
// 添加文件条目
public void addFileEntryZip(String fileName)
{
try
{
zos.putNextEntry(new ZipEntry(fileName));
} catch (IOException e)
{
e.printStackTrace();
}
}
public void addDirectoryEntryZip(String directoryName)
{
try
{
zos.putNextEntry(new ZipEntry(directoryName + "/"));
} catch (IOException e)
{
e.printStackTrace();
}
}
// 遍历文件夹
public void listMyDirectory(String filePath)
{
File f = new File(filePath);
File[] files = f.listFiles();
if(files!=null)
{
for (File currentFile : files)
{
// 设置条目名称(此步骤非常关键)
String entryName= currentFile.getAbsolutePath().split(":")[1].substring(1);
// 获取文件物理路径
String absolutePath = currentFile.getAbsolutePath();
if (currentFile.isDirectory())
{
addDirectoryEntryZip(entryName);
//进行递归调用
listMyDirectory(absolutePath);
}
else
{
addFileEntryZip(entryName);
writeToEntryZip(absolutePath);
}
}
}
}
// 主要流程
public void mainWorkFlow()
{
listMyDirectory(this.sourceFilePath);
if(zos!=null)
try
{
zos.close();
} catch (IOException e)
{
e.printStackTrace();
}
}
public static void main(String[] args)
{
new MyMultipleFileZip("F:/fountainDirectory").mainWorkFlow();
}
}