java 实现计算器

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import java.awt.Container;
import java.awt.GridLayout;
import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;
 
/**
 * Java计算器 Calculater
 */
public class Calculater extends JFrame implements ActionListener {
    JFrame jf;
    JTextField jtf;
    String[] b = new String[] { "+", "-", "*", "/", "." };
    JButton jis = new JButton("=");
    private int temp = 0;
    private float result = 0;
    private float fnumber = 0, bnumber = 0;
 
    public Calculater() {
        init();
    }
 
    public void init() {
        jf = new JFrame();
        jtf = new JTextField();
 
        Container c = jf.getContentPane();// Returns the contentPane object for
                                            // this frame.
        jtf.setHorizontalAlignment(JTextField.RIGHT);// 设置文本的水平对齐方式
        jtf.setLayout(new GridLayout());
        c.add(jtf, BorderLayout.NORTH);//
 
        JPanel jp = new JPanel();
        jp.setLayout(new GridLayout(4, 4));// 对于GridLayout(int rows,int
                                            // cols)详情请参见API
        c.add(jp, BorderLayout.CENTER);/* 这里刚开始犯了一低级错误，将c写成了jp，逻辑调用都出现了问题 */
 
        JButton[] ja = new JButton[10];
        JButton[] jb = new JButton[5];
        for (int i = 0; i < 10; i++) {
            ja[i] = new JButton("" + i);
            ja[i].addActionListener(this);
        }
        for (int j = 0; j < 5; j++) {
            jb[j] = new JButton("" + b[j]);
            jb[j].addActionListener(this);
        }
 
        for (int i = 0; i < 10; i++) {
            jp.add(ja[i]);
        }
        for (int j = 0; j < 5; j++) {
            jp.add(jb[j]);
        }
 
        jp.add(jis);
        jis.addActionListener(this);
        jf.setSize(200, 300);
        jf.setVisible(true);
    }
 
    public void actionPerformed(ActionEvent e) {
        String s = e.getActionCommand();
        if (s.equals("+")) {
            this.fnumber = Float.parseFloat(this.jtf.getText());
            this.jtf.setText("");
            this.temp = 1;
        } else if (s.equals("-")) {
            this.fnumber = Float.parseFloat(this.jtf.getText());
            this.jtf.setText("");
            this.temp = 2;
        } else if (s.equals("*")) {
            this.fnumber = Float.parseFloat(this.jtf.getText());
            this.jtf.setText("");
            this.temp = 3;
        } else if (s.equals("/")) {
            this.fnumber = Float.parseFloat(this.jtf.getText());
            this.jtf.setText("");
            this.temp = 4;
        } else if (s.equals(".")) {
            if (jtf.equals("")) {
                jtf.setText("0.");
            } else {
                jtf.setText(jtf.getText() + ".");
            }
        } else if (s.equals("=")) {
            this.bnumber = Integer.parseInt(this.jtf.getText());
            switch (this.temp) {
            case 1:
                result = fnumber + bnumber;
                this.jtf.setText(String.valueOf(result));
                break;
            case 2:
                result = fnumber - bnumber;
                this.jtf.setText(String.valueOf(result));
                break;
            case 3:
                result = fnumber * bnumber;
                this.jtf.setText(String.valueOf(result));
                break;
            case 4:
                result = fnumber / bnumber;
                this.jtf.setText(String.valueOf(result));
                break;
            }
        } else {
            jtf.setText(jtf.getText() + e.getActionCommand());
        }
    }
 
    public static void main(String[] args) {
        new Calculater();
    }
}
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