package 计算器;import java.awt.*;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import javax.swing.*;public class A {public static void main(String [] args) {JFrame a=new JFrame("计算器");a.setBounds(0,0,800,800);a.setLayout(null);JButton b1=new JButton("CE");a.add(b1);b1.setForeground(Color.red);b1.setBounds(0,665,100,100);b1.setFont(new Font("宋体",Font.PLAIN,60));JButton b2=new JButton("0");a.add(b2);b2.setBounds(100,665,100,100);b2.setFont(new Font("宋体",Font.PLAIN,60));JButton b3=new JButton("=");a.add(b3);b3.setBounds(200,665,100,100);b3.setFont(new Font("宋体",Font.PLAIN,60));JButton b4=new JButton("/");a.add(b4);b4.setBounds(300,665,100,100);b4.setFont(new Font("宋体",Font.PLAIN,60));JButton b5=new JButton("1");a.add(b5);b5.setBounds(0,566,100,100);b5.setFont(new Font("宋体",Font.PLAIN,60));JButton b6=new JButton("2");a.add(b6);b6.setBounds(100,566,100,100);b6.setFont(new Font("宋体",Font.PLAIN,60));JButton b7=new JButton("3");a.add(b7);b7.setBounds(200,566,100,100);b7.setFont(new Font("宋体",Font.PLAIN,60));JButton b8=new JButton("*");a.add(b8);b8.setBounds(300,566,100,100);b8.setFont(new Font("宋体",Font.PLAIN,60));JButton b9=new JButton("4");a.add(b9);b9.setBounds(0,467,100,100);b9.setFont(new Font("宋体",Font.PLAIN,60));JButton b10=new JButton("5");a.add(b10);b10.setBounds(100,467,100,100);b10.setFont(new Font("宋体",Font.PLAIN,60));JButton b11=new JButton("6");a.add(b11);b11.setBounds(200,467,100,100);b11.setFont(new Font("宋体",Font.PLAIN,60));JButton b12=new JButton("-");a.add(b12);b12.setBounds(300,467,100,100);b12.setFont(new Font("宋体",Font.PLAIN,60));JButton b13=new JButton("7");a.add(b13);b13.setBounds(0,367,100,100);b13.setFont(new Font("宋体",Font.PLAIN,60));JButton b14=new JButton("8");a.add(b14);b14.setBounds(100,367,100,100);b14.setFont(new Font("宋体",Font.PLAIN,60));JButton b15=new JButton("9");a.add(b15);b15.setBounds(200,367,100,100);b15.setFont(new Font("宋体",Font.PLAIN,60));JButton b16=new JButton("+");a.add(b16);b16.setBounds(300,367,100,100);b16.setFont(new Font("宋体",Font.PLAIN,60));JLabel l1=new JLabel("式子");JLabel l2=new JLabel("答案");l1.setFont(new Font("宋体",Font.PLAIN,40));l2.setFont(new Font("宋体",Font.PLAIN,40));l1.setBounds(20,50,100,100);l2.setBounds(20,200,100,100);a.add(l1);a.add(l2);JTextArea t1=new JTextArea();JTextArea t2=new JTextArea();t1.setFont(new Font("宋体",Font.PLAIN,100));t2.setFont(new Font("宋体",Font.PLAIN,100));t1.setBounds(120,50,500,100);t2.setBounds(120,200, 500, 100);a.add(t2);a.add(t1);b1.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {t1.setText("");t2.setText("");}});b2.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {t1.append("0");}});b3.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {int n1=0;int n2=0;int i=0;char c;String s=t1.getText();for(i=0;s.charAt(i)>='0'&&s.charAt(i)<='9';i++) {n1=n1*10+(s.charAt(i)-'0');}c=s.charAt(i++);for(;i<s.length();i++) {n2=n2*10+(s.charAt(i)-'0');}switch(c) {case '+':n1=n1+n2; break;case '-':n1=n1-n2; break;case '*':n1=n1*n2; break;case '/':n1=n1/n2; break;}t2.setText(String.valueOf(n1));}});b4.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {t1.append("/");}});b5.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {t1.append("1");}});b6.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {t1.append("2");}});b7.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {t1.append("3");}});b8.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {t1.append("*");}});b9.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {t1.append("4");}});b10.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {t1.append("5");}});b11.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {t1.append("6");}});b12.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {t1.append("-");}});b13.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {t1.append("7");}});b14.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {t1.append("8");}});b15.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {t1.append("9");}});b16.addActionListener(new ActionListener() {public void actionPerformed(ActionEvent e) {t1.append("+");}});a.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);a.setVisible(true);}}
