《JAVA》用户登录及字体选择的界面设计及事件响应_pnlmain

5-1

package jAVA;

import java.awt.Color;

import java.awt.Component;

import java.awt.Container;

import java.awt.Dimension;

import java.awt.GridLayout;

import java.awt.Image;

import java.awt.Toolkit;

import javax.swing.ImageIcon;

import javax.swing.JButton;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JPanel;

import javax.swing.JPasswordField;

import javax.swing.JTextField;

import util.Common;

public class Main extends JFrame{

public Main(){

setSize(260,220);

setTitle("登陆");

Toolkit toolkit=Toolkit.getDefaultToolkit();

Dimension dsSize=toolkit.getScreenSize();

        setLocation(dsSize.width/2-getWidth()/2,dsSize.height/2-getHeight()/2);

        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        Image image=toolkit.getImage(Common.getClassPath()+"pic/logo.jpg");

        setIconImage(image);

        Container pnlMain=this.getContentPane();

        pnlMain.setLayout(new GridLayout(3,1));

        JPanel pnlTop=new JPanel();pnlTop.setBackground(Color.red);

        JPanel pnlMid=new JPanel();pnlMid.setBackground(Color.yellow);

        JPanel pnlBot=new JPanel();pnlBot.setBackground(Color.blue);

        pnlMain.add(pnlTop);pnlMain.add(pnlMid);pnlMain.add(pnlBot);

        JLabel lblTop=new JLabel();

        lblTop.setIcon(new ImageIcon(Common.getClassPath()+"pic/school.jpg"));

        pnlTop.add(lblTop);

        JLabel lblUserName=new JLabel("用户名(U)：");

        JTextField txtUserName=new JTextField(12);

        JLabel lblPasswd=new JLabel("口    令(P)：");

        JPasswordField pwdPasswd=new JPasswordField(12);

        pnlMid.add(lblUserName);pnlMid.add(txtUserName);

        pnlMid.add(lblPasswd);pnlMid.add(pwdPasswd);

        JButton btnLogin=new JButton("登陆(L)");

        JButton btnExit=new JButton("退出(X)");

        btnLogin.setMnemonic('L');

        pnlBot.add(btnLogin);pnlBot.add(btnExit);

        this.setVisible(true);

    }

public static void main(String[] args){

new Main().setVisible(true);

}

}

package util;

public class Common {

    public static String getClassPath(){

     return Thread.currentThread()

     .getContextClassLoader().getResource("").getPath();

    }

public static void main(String[] args) {

System.out.println( Common.getClassPath() );

}

}

5-2

package ja;

/*参考如下图形，完成字体选择的界面设计及事件响应。*/

/**

 * @author 

 */

import java.awt.*;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import javax.swing.ButtonGroup;

import javax.swing.JButton;

import javax.swing.JCheckBox;

import javax.swing.JComboBox;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JList;

import javax.swing.JPanel;

import javax.swing.JRadioButton;

import javax.swing.JTextArea;

import ja.Common;

public class Sy5_2 extends JFrame implements ActionListener{

private JPanel pnlMain=new JPanel();

private JLabel lblSize,lblType,lblTest;

private ButtonGroup grpColor;

private JRadioButton rbtnRed,rbtnGreen;

private JCheckBox chkBold,chkItalic;

private JButton btnExit,btnOk;

private List lstSize;

private JList lstSize2;

private JComboBox cmbType;

String[] strType={"宋体","隶书","楷体_GB2312","仿宋_GB2312"};

String[] strSize={"5","8","9","10","11","12","14","16","18","20","22","24","26","28","36","48","72"};

JTextArea txtArea;

public void initFrm(){

Toolkit toolkit=Toolkit.getDefaultToolkit();

Dimension dsSize;

    this.setTitle("字体设置器");

    this.setIconImage(toolkit.getImage(Common.getClassPath()+"pic/logo.jpg"));

    this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    this.setSize(250,290);

    dsSize=toolkit.getScreenSize();

    this.setLocation(dsSize.width/2-this.getWidth()/2,dsSize.height/2-this.getHeight()/2);

    this.setResizable(false);

    this.setContentPane(pnlMain);

}

public void setFontType(){

lblType=new JLabel("请选择字体");

cmbType=new JComboBox(strType);

pnlMain.add(lblType);

pnlMain.add(cmbType);

}

public void setFontSize2(){

ScrollPane sp=new ScrollPane();

lblSize=new JLabel("请选择字形");

lstSize2=new JList(new String[]{"2","4","6","8","10","12","14","16"});

lstSize2.setSelectedIndex(0);

sp.add(lstSize2);

pnlMain.add(lblSize);

pnlMain.add(sp);

}

public void setFontSize(){

lblSize=new JLabel("请选择字形");

lstSize=new List();

for(int i=10;i<30;i+=2){

lstSize.add(String.valueOf(i));

}

lstSize.select(0);

pnlMain.add(lblSize);

pnlMain.add(lstSize);

}

public void setFontColor(){

rbtnRed=new JRadioButton("红色");

rbtnGreen=new JRadioButton("绿色");

rbtnRed.setSelected(true);

pnlMain.add(rbtnRed);

pnlMain.add(rbtnGreen);

grpColor=new ButtonGroup();

grpColor.add(rbtnRed);

grpColor.add(rbtnGreen);

}

public void setFontStyle(){

chkBold=new JCheckBox("加粗");

chkItalic=new JCheckBox("斜体");

pnlMain.add(chkBold);

pnlMain.add(chkItalic);

}   

public void setFontTest(){

txtArea=new JTextArea("这是测试文字\r\n        请选择后按【确定】",5,18);

btnOk=new JButton("确定");

btnExit=new JButton("退出");

btnOk.addActionListener(this);

btnExit.addActionListener(this);

pnlMain.add(txtArea);

pnlMain.add(btnOk);

pnlMain.add(btnExit);

}

public Sy5_2(){

initFrm();

setFontType();

setFontSize2();

setFontColor();

setFontStyle();

setFontTest();

}

@Override

public void actionPerformed(ActionEvent e) {

       if(e.getSource()==btnExit)

        System.exit(0);

       else{

        String strType=(String)cmbType.getSelectedItem();

        int iSize=Integer.parseInt(lstSize.getItem(lstSize.getSelectedIndex()));

        int iFlag=0;

        if(chkBold.isSelected())

        iFlag+=Font.BOLD;

        if(chkItalic.isSelected())

        iFlag+=Font.ITALIC;

        Font font=new Font(strType,iFlag,iSize);

        txtArea.setFont(font);

        if(rbtnRed.isSelected())

        txtArea.setForeground(Color.red);

        else

        txtArea.setForeground(Color.green);

       }

}

public static void main(String arg[]){

new Sy5_2().setVisible(true);

}

}

package suanfa;

import java.util.Scanner;

/**

 * 1．定义一个抽象类Shpae表示形状，给定颜色属性String color

 * ,提供一个不带参数的构造方法和一个带参数的构造方法，完成对属性的赋值，

 * 提供一个计算面积的抽象方法area()。定义一个类Circle表示圆形，

 * 继承于Shape，给定专有属性半径double r,提供两个构造方法。

 * 定义一个类Rectangle表示矩形，继承于Shpae,

 * 给定专有属性长length、宽width ,提供两个构造方法

 * 。定义一个测试类TestShape,完成圆、矩形对象的创建和面积的计算。

 *

 */

abstract class Shape{

protected String color;

//不带参数的构造函数

public Shape() {

super();

}

//带参数的构造函数

public Shape(String color) {

super();

this.color = color;

}

//计算面积的抽象方法

public abstract double area();

//定义一个圆，继承于形状

class Circle extends Shape{

//专有属性半径

private double r;

//提供两个构造方法。

        public Circle(double r) {

super();

this.r = r;

}

public Circle() {

r=1.0;

}

public  double area(){

return 3.14*r*r;

}

//定义一个类Rectangle表示矩形，继承于Shpae,

class Rectangle extends Shape{

//定专有属性长length、宽width

private double length;

private double width;

//提供两个构造方法。

public Rectangle(double length, double width) {

super();

this.length = length;

this.width = width;

}

public Rectangle() {

super();

}

public  double area(){

return width*width;

}

}

}