ton_0.setFont(new Font("SansSerif",0,12));
button_0.setForeground(Color.blue);
button_0.setBorder(BorderFactory.createRaisedBevelBorder());
button_0.setText("0");
button_1.setFont(new Font("SansSerif",0,12));
button_1.setForeground(Color.blue);
button_1.setBorder(BorderFactory.createRaisedBevelBorder());
button_1.setText("1");
button_2.setFont(new Font("SansSerif",0,12));
button_2.setForeground(Color.blue);
button_2.setBorder(BorderFactory.createRaisedBevelBorder());
button_2.setText("2");
button_3.setFont(new Font("SansSerif",0,12));
button_3.setForeground(Color.blue);
button_3.setBorder(BorderFactory.createRaisedBevelBorder());
button_3.setText("3");
button_4.setFont(new Font("SansSerif",0,12));
button_4.setForeground(Color.blue);
button_4.setBorder(BorderFactory.createRaisedBevelBorder());
button_4.setText("4");
button_5.setFont(new Font("SansSerif",0,12));
button_5.setForeground(Color.blue);
button_5.setBorder(BorderFactory.createRaisedBevelBorder());
button_5.setText("5");
button_6.setFont(new Font("SansSerif",0,12));
button_6.setForeground(Color.blue);
button_6.setBorder(BorderFactory.createRaisedBevelBorder());
button_6.setText("6");
button_7.setFont(new Font("SansSerif",0,12));
button_7.setForeground(Color.blue);
button_7.setBorder(BorderFactory.createRaisedBevelBorder());
button_7.setText("7");
button_8.setFont(new Font("SansSerif",0,12));
button_8.setForeground(Color.blue);
button_8.setBorder(BorderFactory.createRaisedBevelBorder());
button_8.setText("8");
button_9.setFont(new Font("SansSerif",0,12));
button_9.setForeground(Color.blue);
button_9.setBorder(BorderFactory.createRaisedBevelBorder());
button_9.setText("9");
button_PI.setFont(new Font("SansSerif",0,12));
button_PI.setForeground(Color.blue);
button_PI.setBorder(BorderFactory.createRaisedBevelBorder());
button_PI.setText("π");
button_E.setFont(new Font("SansSerif",0,12));
button_E.setForeground(Color.blue);
button_E.setBorder(BorderFactory.createRaisedBevelBorder());
button_E.setText("E");
button_add.setFont(new Font("SansSerif",0,12));
button_add.setForeground(Color.red);
button_add.setBorder(BorderFactory.createRaisedBevelBorder());
button_add.setText("+");
button_sub.setFont(new Font("SansSerif",0,12));
button_sub.setForeground(Color.red);
button_sub.setBorder(BorderFactory.createRaisedBevelBorder());
button_sub.setText("-");
button_mul.setFont(new Font("SansSerif",0,12));
button_mul.setFo
reground(Color.red);
button_mul.setBorder(BorderFactory.createRaisedBevelBorder());
button_mul.setText("*");
button_div.setFont(new Font("SansSerif",0,12));
button_div.setForeground(Color.red);
button_div.setBorder(BorderFactory.createRaisedBevelBorder());
button_div.setText("/");
button_sqrt.setFont(new Font("SansSerif",0,12));
button_sqrt.setForeground(Color.red);
button_sqrt.setBorder(BorderFactory.createRaisedBevelBorder());
button_sqrt.setText("sqrt");
button_daoshu.setFont(ne