最简单的 BorderLayout布局例子：

最简单的 BorderLayout布局例子：

import javax.swing.JFrame;

import javax.swing.JButton;

import java.awt.Container;

import java.awt.BorderLayout;

public class TopLevJF{

public static void main(String[] args){

JFrame jf = new JFrame();

Container containtPane = jf.getContentPane();

containtPane.add(new JButton("North"),BorderLayout.NORTH);

containtPane.add(new JButton("Sourth"),BorderLayout.SOUTH);

containtPane.add(new JButton("CENTER"),BorderLayout.CENTER);

containtPane.add(new JButton("East"),BorderLayout.EAST);

containtPane.add(new JButton("North"),BorderLayout.WEST);

jf.setSize(300,200);

jf.setVisible(true);

jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

}

}

最简单的从键盘读入并输出的例子；

 import java.io.InputStream;

import java.io.IOException;

public class STream{

public static void main(String[] args){

byte[] b = new byte[10]; 

try{

System.in.read(b);

}

catch(IOException e){

e.printStackTrace();

}

for(int i= 0;i<b.length;i++)

System.out.println(b[i]);

}

}

最简单的从硬盘读取文件并输出的例子：

 import java.io.IOException;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

public class ReadFile{

public static void main(String[] args){

try{

FileInputStream fi = new FileInputStream("D:\\work\\java_workspace\\haha.txt");

int i;

//写代码一定要讲究灵活性：

//while(i=fi.read() != valited){

//System.out.println(b[i++]);

/*while((i=fi.read()).toString().equals(valited.toString())){

System.out.println(i);*/

try{

i=fi.read();

while(i != -1){

System.out.print((char)i);

i = fi.read();

}

}catch(IOException e){

e.printStackTrace();

}

}catch(FileNotFoundException e){

e.printStackTrace();

}

}

}

最简单的硬盘文件拷贝：

 import java.io.IOException;

import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

public class ReadFile{

public static void main(String[] args){

try{

FileInputStream fi = new FileInputStream("C:\\work\\java_workspace\\haha.txt");

FileOutputStream fos = new FileOutputStream("C:\\work\\java_workspace\\haha_copy.txt");

int i;

//while(i=fi.read() != valited){

//System.out.println(b[i++]);

/*while((i=fi.read()).toString().equals(valited.toString())){

System.out.println(i);*/

try{

i=fi.read();

while(i != -1){

System.out.print((char)i);

fos.write((char)i);

i = fi.read();

}

}catch(IOException e){

e.printStackTrace();

}

}catch(FileNotFoundException e){

e.printStackTrace();

}

}

}