窗口實訓1 import java.awt.BorderLayout; import java.awt.GridLayout; import javax.swing.*; public class zyy {JFrame a1;JButton a2;JPanel a3;JTextField a4;String[] xiaosi= {"7","8","9","/","4","5","6","*","1","2","3","-","0",".","=","+"};public zyy() {a1=new JFrame("計算機");a3=new JPanel(new GridLayout(4,4,0,0));a4=new JTextField();a1.add(BorderLayout.NORTH,a4);a1.add(BorderLayout.CENTER,a3);for(int i=0;i<16;i++) { a2=new JButton(xiaosi[i]);a3.add(a2);}a1.setVisible(true);a1.setSize(400,200); }public static void main(String[] args) {new zyy();} }

import java.awt.BorderLayout; import java.awt.Color; import java.awt.event.ActionEvent; import java.awt.event.ActionListener;import javax.swing.*; public class zy implements ActionListener {JFrame a1;JButton a2,a22,a222;JPanel a3,a4;BorderLayout a5; public zy(){a1=new JFrame();a3=new JPanel();a4=new JPanel();new BorderLayout();a1.add(BorderLayout.NORTH,a3);a1.add(BorderLayout.CENTER,a4);a2=new JButton("紅色");a2.addActionListener(this);a3.add(a2);a22=new JButton("綠色");a22.addActionListener(this);a3.add(a22);a222=new JButton("藍色");a222.addActionListener(this);a3.add(a222); a1.setVisible(true);a1.setSize(400,300); } public static void main(String[] args){new zy(); } public void actionPerformed(ActionEvent e){JButton b=(JButton)e.getSource();if(b==a2) {a4.setBackground(Color.RED);}else if(b==a22) {a4.setBackground(Color.GREEN);}else if(b==a222) {a4.setBackground(Color.BLUE);} } }

posted on 2019-05-29 19:58 楊蒙 閱讀(...) 評論(...) 編輯 收藏

轉載于:https://www.cnblogs.com/YM4396/p/10945838.html

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