import java.awt.Color;import java.awt.Container;import java.awt.GridLayout;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.JLabel;import javax.swing.JPanel;import javax.swing.JTextField;class myWindows extends JFrame implements ActionListener{        private static final long serialVersionUID = 1L;        boolean tag=true;         boolean signal=true;    JTextField text1;    public myWindows(int w,int h)    {        setTitle("计算器程序");        this.setBounds(100,100,350,300);        Container con = getContentPane();        con.setLayout(new GridLayout(3,1));        JPanel p1 = new JPanel();        p1.setLayout(new GridLayout(2,1));        text1 = new JTextField(150);        text1.setHorizontalAlignment(text1.RIGHT);        text1.setText("0.");        JPanel p1_1  = new JPanel();        p1_1.setLayout(new GridLayout(1,4));        JButton btn_BackSpace = new JButton("BackSpace");        btn_BackSpace.setForeground(Color.red);        btn_BackSpace.addActionListener(this);        JButton btn_CE = new JButton("CE");        btn_CE.setForeground(Color.red);        JButton btn_C = new JButton("C");        btn_C.setForeground(Color.red);        btn_C.addActionListener(this);        p1.add(text1);        p1_1.add(new JLabel());        p1_1.add(btn_BackSpace);        p1_1.add(btn_CE);        p1_1.add(btn_C);        p1.add(p1_1);               JPanel p2 = new JPanel();        p2.setLayout(new GridLayout(2,1));        JPanel p2_1 = new JPanel();        p2_1.setLayout(new GridLayout(1,6));        JButton btn_MC = new JButton("MC");        btn_MC.setForeground(Color.red);        JButton btn_7 = new JButton("7");        btn_7.setForeground(Color.BLUE);        btn_7.addActionListener(this);        JButton btn_8 = new JButton("8");        btn_8.setForeground(Color.BLUE);        btn_8.addActionListener(this);        JButton btn_9 = new JButton("9");        btn_9.setForeground(Color.BLUE);        btn_9.addActionListener(this);        JButton btn_wind= new JButton("/");        btn_wind.setForeground(Color.red);        JButton btn_sqrt = new JButton("sqrt");        btn_sqrt.setForeground(Color.BLUE);        p2_1.add(btn_MC); p2_1.add(btn_7);        p2_1.add(btn_8); p2_1.add(btn_9);        p2_1.add(btn_wind);p2_1.add(btn_sqrt);        JPanel p2_2 = new JPanel();        p2_2.setLayout(new GridLayout(1,6));        JButton btn_MR = new JButton("MR");        btn_MR.setForeground(Color.red);        JButton btn_4 = new JButton("4");        btn_4.setForeground(Color.BLUE);        btn_4.addActionListener(this);        JButton btn_5 = new JButton("5");        btn_5.setForeground(Color.BLUE);        btn_5.addActionListener(this);        JButton btn_6 = new JButton("6");        btn_6.setForeground(Color.BLUE);        btn_6.addActionListener(this);        JButton btn_star= new JButton("*");        btn_star.setForeground(Color.red);        JButton btn_mod = new JButton("%");        btn_mod.setForeground(Color.BLUE);        p2_2.add(btn_MR);        p2_2.add(btn_4); p2_2.add(btn_5);        p2_2.add(btn_6);         p2_2.add(btn_star);p2_2.add(btn_mod);        p2.add(p2_1);p2.add(p2_2);                JPanel p3 = new JPanel();        p3.setLayout(new GridLayout(2,1));        JPanel p3_1 = new JPanel();        p3_1.setLayout(new GridLayout(1,6));        JButton btn_MS = new JButton("MS");        btn_MS.setForeground(Color.red);        JButton btn_1 = new JButton("1");        btn_1.setForeground(Color.BLUE);        btn_1.addActionListener(this);        JButton btn_2 = new JButton("2");        btn_2.setForeground(Color.BLUE);        btn_2.addActionListener(this);        JButton btn_3 = new JButton("3");        btn_3.setForeground(Color.BLUE);        btn_3.addActionListener(this);        JButton btn_sub= new JButton("-");        btn_sub.setForeground(Color.red);        JButton btn_reverse = new JButton("1/x");        btn_reverse.setForeground(Color.BLUE);        p3_1.add(btn_MS); p3_1.add(btn_1);        p3_1.add(btn_2); p3_1.add(btn_3);        p3_1.add(btn_sub);p3_1.add(btn_reverse);        JPanel p3_2 = new JPanel();        p3_2.setLayout(new GridLayout(1,6));        JButton btn_Madd = new JButton("M+");        btn_Madd.setForeground(Color.red);        JButton btn_0= new JButton("0");        btn_0.setForeground(Color.BLUE);        btn_0.addActionListener(this);        JButton btn_singal = new JButton("+/-");        btn_singal.setForeground(Color.BLUE);        btn_singal.addActionListener(this);        JButton btn_dot = new JButton(".");        btn_dot.addActionListener(this);        JButton btn_add= new JButton("+");        btn_add.setForeground(Color.red);        JButton btn_equal = new JButton("=");        btn_equal.setForeground(Color.red);        p3_2.add(btn_Madd);        p3_2.add(btn_0); p3_2.add(btn_singal);        p3_2.add(btn_dot);        p3_2.add(btn_add);p3_2.add(btn_equal);        p3.add(p3_1);p3.add(p3_2);        con.add(p1);con.add(p2);con.add(p3);        setVisible(true);    }    public void press_dot()    {        tag=false;    }