怎样用java编写图形界面的Application程序

java里边图形界面编程

import java.awt.*;import javax.swing.*;public class test2 extends JFrame { public static void main(String[] args){ test2 a = new test2();} public test2(){ JButton a1 = new JButton("东");JButton a2 = new JButton("西");JButton a3 = new JButton("南");JButton a4 ...

求一个java程序 基于Swing的图形用户界面设计

import java.awt.Font;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.awt.event.KeyEvent;import java.awt.event.KeyListener;import java.util.Enumeration;import java.util.Random;import javax.swing.JFrame;import javax.swing.JOptionPane;import javax.swing.UIM...

Java程序--编写一个具有图形界面的计算器程序

import java.awt.event.*;import java.io.*;public class Test implements ActionListener { Frame f = new Frame("一步运算计算器");//创建窗架 TextField[] tf = new TextField[3];Label La1 = new Label("+");Button btn = new Button("=");int[] a = new int[3]; //储存...

java设计一个求三角形面积的图形界面,要求通过3个输入框输入3个边长

double a = Double.parseDouble(tf1.getText());double b = Double.parseDouble(tf2.getText());double c = Double.parseDouble(tf3.getText());if (a + b

用java编写随意输入一个字母显示其下一个字母例如输入a显示b输入A显示B

import java.util.Scanner;public class Test { public static boolean isLetter(String s) { if (s.length() != 1) { return false;} char c = s.charAt(0);return Character.isLetter(c);} public static char getNextLetter(char c) { if (Character.isUpperCase(c)) { return (char)...