java简单计算器实验报告答:import java.awt.*;import java.awt.event.*;import javax.swing.*;public class 计算器 extends JFrame implements ActionListener { private final String[] KEYS = { "7", "8", "9", "÷", "sqrt", "4", "5", "6","×", "%", "1", "2", "3", "-", "1/x", "0"...