JFrame简单使用

import java.awt.Color;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;import javax.swing.JFrame;public class MyFrame {public static void main(String[] args) {JFrame frame = new JFrame("我的第一个Frame");frame.setSize(500 , 1000);frame.getContentPane().setBackground(Color.RED);frame.setVisible(true);BufferedReader intemp = new BufferedReader(new InputStreamReader(System.in));System.out.println("Press return key to exit.");try{String s = intemp.readLine();} catch(IOException e){System.out.println("IOException");}System.exit(0);}//main 结束}

import java.awt.Color;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;import javax.swing.JFrame;
import javax.swing.JPanel;public class FrameWithPanelTest {public static void main(String[] args) {JFrame frame = new JFrame("My Frame");frame.setSize(500 , 500);frame.getContentPane().setBackground(Color.BLACK);frame.setVisible(true);JPanel contentPane = new JPanel();contentPane.setSize(100 , 100);contentPane.setBackground(Color.yellow);frame.add(contentPane);frame.setLayout(null); //不加上这一句设置布局，contentPanel会铺满整个frameBufferedReader intemp = new BufferedReader(new InputStreamReader(System.in));System.out.println("Press return key to exit.");try{String s = intemp.readLine();} catch(IOException e){System.out.println("IOException");}System.exit(0);}}

import java.awt.Color;
import java.awt.FlowLayout;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;public class FrameWithPanelTest {public static void main(String[] args) {JFrame frame = new JFrame("My Frame");frame.setSize(500 , 500);frame.getContentPane().setBackground(Color.BLACK);frame.setLayout(new FlowLayout(FlowLayout.CENTER , 50 , 50)); //为JFrame顶层容器设置FlowLayout布局管理器JPanel contentPane = new JPanel();contentPane.setSize(100 , 100);//内部按钮对齐方式，水平和垂直间距contentPane.setLayout(new FlowLayout(FlowLayout.CENTER , 50 , 50)); //为Japnel设置布局管理器contentPane.setBackground(Color.yellow);JButton btn1 , btn2 , btn3 ; //定义3个按钮btn1 = new JButton("打开");btn2 = new JButton("关闭");btn3 = new JButton("返回");contentPane.add(btn1);contentPane.add(btn2);contentPane.add(btn3);frame.add(contentPane);frame.setVisible(true); //显示JFrameBufferedReader intemp = new BufferedReader(new InputStreamReader(System.in));System.out.println("Press return key to exit.");try{String s = intemp.readLine();} catch(IOException e){System.out.println("IOException");}System.exit(0);}}

4.在上面代码加入下列语句

contentPane.add(new JLabel()); //空标签站位用
contentPane.add(new JLabel()); //空标签站位用
contentPane.add(new JLabel()); //空标签站位用

5.鼠标按键测试代码

import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionListener;import javax.swing.JFrame;
import javax.swing.JLabel;//鼠标及按键
public class MouseControl implements MouseMotionListener , KeyListener{private JFrame frame;private JLabel tf;String ch = ""; //放置待显示的字符public static void main(String[] args){MouseControl two = new MouseControl();two.go();}private void go() {frame = new JFrame("鼠标按键测试");Container contentPane = frame.getContentPane();contentPane.add(new JLabel("get mouse and keyboard event") , BorderLayout.NORTH);tf = new JLabel();contentPane.add(tf, BorderLayout.SOUTH);//注册监听程序frame.addMouseMotionListener(this);frame.addKeyListener(this);frame.setSize(300 , 300);frame.setVisible(true);}//接下来为实现接口中的方法@Overridepublic void keyTyped(KeyEvent e) { //顺序 keypress keytype keyrelease// TODO Auto-generated method stubSystem.out.println("2");int charcode = e.getKeyCode();ch = "有键按下2";if(charcode == KeyEvent.VK_SHIFT) {ch = "shift2";}if(charcode == KeyEvent.VK_CONTROL) ch = "control2";}@Overridepublic void keyPressed(KeyEvent e) { //看不到显示，因为keytype覆盖了// TODO Auto-generated method stubSystem.out.println("1");int charcode = e.getKeyCode();ch = "有键按下1";if(charcode == KeyEvent.VK_SHIFT) ch = "shift1";if(charcode == KeyEvent.VK_CONTROL) ch = "control1";}@Overridepublic void keyReleased(KeyEvent e) {// TODO Auto-generated method stub//ch = "有键松开";System.out.println("3");}@Overridepublic void mouseDragged(MouseEvent e) { //按住鼠标拖动才会调用// TODO Auto-generated method stubString s = "鼠标拖动的坐标: X =" +e.getX() + " Y =" + e.getY() + " KEY：" + ch;tf.setText(s);}@Overridepublic void mouseMoved(MouseEvent e) {// TODO Auto-generated method stubString s = "鼠标移动时的坐标: X =" +e.getX() + " Y =" + e.getY() + " KEY：" + ch;tf.setText(s);}}

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