黑马程序员——java中的 GUI

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GUI

Graphical user Interface（图形用户接口）

用图形的方式，来显示计算机操作界面

java为GUI提供的界面都存在java.AWT和java.swing两个包中

实例：

public class Jfram extends JFrame{

public static void main(String[] args) {

Jfram jf=new Jfram();

jf.setSize(400,300);

jf.setLocation(300,100);

jf.setTitle("NUMBER");

jf.setLayout(new FlowLayout());

jf.addWindowListener(new WindowAdapter() {

public void windowclosing(){

System.out.print("关闭");

System.exit(0);

}

});//关闭窗口

TextField tf=new TextField(20);

Button button=new Button("按钮");

jf.add(tf);

jf.add(button);//添加按钮

// button.addActionListener(new ActionListener() {

//

// @Override

// public void actionPerformed(ActionEvent arg0) {

// // TODO Auto-generated method stub

// System.exit(0);

// }

// });//退出按钮

button.addMouseListener(new MouseListener() {

private int i=0;

public void mouseClicked(MouseEvent arg0) {

// TODO Auto-generated method stub

System.out.println("点击了： "+i++);

}

@Override

public void mouseEntered(MouseEvent arg0) {

// TODO Auto-generated method stub

System.out.println("鼠标进入： "+i++);

}

@Override

public void mouseExited(MouseEvent arg0) {

// TODO Auto-generated method stub

}

@Override

public void mousePressed(MouseEvent arg0) {

// TODO Auto-generated method stub

}

@Override

public void mouseReleased(MouseEvent arg0) {

// TODO Auto-generated method stub

}

});

tf.addKeyListener(new KeyListener() {

@Override

public void keyTyped(KeyEvent arg0) {

// TODO Auto-generated method stub

}

@Override

public void keyReleased(KeyEvent arg0) {

// TODO Auto-generated method stub

}

@Override

public void keyPressed(KeyEvent e) {

// TODO Auto-generated method stub

int code=e.getKeyCode();

if(!(code >= KeyEvent.VK_0 && code <=KeyEvent.VK_9)){

System.out.print("非法字符:"+code);

e.consume();

}

}

});

jf.setVisible(true);

}

}

简单记事本打开和保存

打开：

public class JFram2 extends JFrame{

public static Button bt;

private static TextField tf;

private static TextArea ta;

private static Dialog d;

private static Label la;

private static Button okbt;

public static void main(String[] args) {

JFram2 jf=new JFram2();

jf.setBounds(100, 100, 500, 400);

jf.setLayout(new FlowLayout());

jf.setTitle("JAVA");

d=new Dialog(jf, "显示错误",true);

la=new Label();

okbt=new Button("确定");

d.setBounds(200, 150, 300, 200);

d.setLayout(new FlowLayout());

d.add(la);

d.add(okbt);

bt=new Button("转换");

tf=new TextField(32);

ta=new TextArea(15,40);

jf.add(tf);

jf.add(bt);

jf.add(ta);

bt.addActionListener(new ActionListener() {

public void actionPerformed(ActionEvent e) {

String text=tf.getText();//获得数据

File file=new File(text);

if(file.exists() && file.isDirectory()){

ta.setText("");

String[] names=file.list();

for(String name : names){

ta.append(name+"\t\n");

}

}

else

{

String info="您输入信息： "+text+" 是错误 ， 请关闭重新输入";

la.setText(info);

d.setVisible(true);

}

//tf.setText("");//显示数据 制空

}

});

//按键盘回车键进入事件中

tf.addKeyListener(new KeyListener() {

@Override

public void keyTyped(KeyEvent arg0) {

// TODO Auto-generated method stub

}

@Override

public void keyReleased(KeyEvent arg0) {

// TODO Auto-generated method stub

}

@Override

public void keyPressed(KeyEvent e) {

// TODO Auto-generated method stub

if(e.getKeyCode()==KeyEvent.VK_ENTER){

String text=tf.getText();//获得数据

File file=new File(text);

if(file.exists() && file.isDirectory()){

ta.setText("");

String[] names=file.list();

for(String name : names){

ta.append(name+"\t\n");

}

}

else

{

String info="您输入信息： "+text+" 是错误 ， 请关闭重新输入";

la.setText(info);

d.setVisible(true);

}

//tf.setText("");//显示数据 制空

}

}

});

//关闭弹出的对话框

d.addWindowListener(new WindowListener() {

@Override

public void windowOpened(WindowEvent arg0) {

// TODO Auto-generated method stub

}

public void windowClosing(WindowEvent arg0) {

// TODO Auto-generated method stub

d.setVisible(false);

}

@Override

public void windowActivated(WindowEvent arg0) {

// TODO Auto-generated method stub

}

@Override

public void windowClosed(WindowEvent arg0) {

// TODO Auto-generated method stub

}

@Override

public void windowDeactivated(WindowEvent arg0) {

// TODO Auto-generated method stub

}

@Override

public void windowDeiconified(WindowEvent arg0) {

// TODO Auto-generated method stub

}

@Override

public void windowIconified(WindowEvent arg0) {

// TODO Auto-generated method stub

}

});

//对话框按键

okbt.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent arg0) {

// TODO Auto-generated method stub

d.setVisible(false);

}

});

//对话框回车键

okbt.addKeyListener(new KeyListener() {

@Override

public void keyTyped(KeyEvent arg0) {

// TODO Auto-generated method stub

}

@Override

public void keyReleased(KeyEvent arg0) {

// TODO Auto-generated method stub

}

@Override

public void keyPressed(KeyEvent e) {

// TODO Auto-generated method stub

if(e.getKeyCode()==KeyEvent.VK_ENTER){

d.setVisible(false);

}

}

});

jf.setVisible(true);

}

}

保存：

import javax.annotation.processing.Filer;

import javax.lang.model.element.Element;

import javax.swing.*;

import javax.tools.FileObject;

import javax.tools.JavaFileObject;

import javax.tools.JavaFileManager.Location;

import java.awt.*;

import java.awt.event.*;

import java.io.*;

public class JFram3 extends JFrame{

private static Menu me,me2;

private static MenuBar mb;

private static MenuItem closeme,saveme,opendme;

private TextArea ta;

private FileDialog openfd,savefd;

private File file;

//事件体

public void eventall(){

closeme.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent arg0) {

// TODO Auto-generated method stub

System.exit(0);

}

});

//打开设计

opendme.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent arg0) {

// TODO Auto-generated method stub

openfd.setVisible(true);

String opendir=openfd.getDirectory();

String openname=openfd.getFile();

if(opendir==null ||openname==null)

return;

//ta.setText("");

File file=new File(opendir, openname);

try {

BufferedReader bf=new BufferedReader(new FileReader(file));

String line=null;

while((line=bf.readLine())!=null){

ta.append(line+"\r\n");

}

bf.close();

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

});

//保存设计

saveme.addActionListener(new ActionListener() {

@Override

public void actionPerformed(ActionEvent arg0) {

// TODO Auto-generated method stub

if(file==null){

savefd.setVisible(true);

String savepath=savefd.getDirectory();

String savename=savefd.getFile();

if(savepath==null ||savename==null)

return;

file=new File(savepath, savename);

}

try {

BufferedWriter bf=new BufferedWriter(new FileWriter(file));

String text=ta.getText();

bf.write(text);

bf.close();

} catch (IOException e) {

// TODO: handle exception

e.printStackTrace();

}

}

});

}

//界面设计

public void windowfram(){

JFram3 jf=new JFram3();

jf.setBounds(100, 100, 500, 400);

//jf.setLayout(new FlowLayout());

jf.setTitle("JAVA");

openfd=new FileDialog(jf,"打开窗体",FileDialog.LOAD);

savefd=new FileDialog(jf,"保存文件",FileDialog.SAVE);

ta=new TextArea();

me=new Menu("文件");//菜单项

me2=new Menu("编辑");

mb=new MenuBar();

opendme=new MenuItem("打开");

saveme=new MenuItem("保存");

closeme=new MenuItem("退出");//子菜单

me.add(opendme);

me.add(saveme);

me.add(closeme);

mb.add(me);

jf.add(ta);

jf.setMenuBar(mb);

jf.setVisible(true);

}

public static void main(String[] args) {

// TODO Auto-generated method stub

JFram3 j=new JFram3();

j.windowfram();

j.eventall();

}

}

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