Java 如何使用ArrayList管理多个JButton?
我不知道如何使用ArrayList。我想声明变量,将它们添加到面板,更改它们的字体和颜色等。下面是我的变量Java 如何使用ArrayList管理多个JButton?,java,swing,list,collections,Java,Swing,List,Collections,我不知道如何使用ArrayList。我想声明变量,将它们添加到面板,更改它们的字体和颜色等。下面是我的变量 import java.awt.BorderLayout; import java.awt.Color; import java.awt.Font; import java.awt.GridLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.util.Arr
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Font;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.ArrayList;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;
public class Calculator extends JFrame implements ActionListener {
// declare number buttons
private JButton zero = new JButton("0");
private JButton one = new JButton("1");
private JButton two = new JButton("2");
private JButton three = new JButton("3");
private JButton four = new JButton("4");
private JButton five = new JButton("5");
private JButton six = new JButton("6");
private JButton seven = new JButton("7");
private JButton eight = new JButton("8");
private JButton nine = new JButton("9");
public Calculator(String name) {
// set overall layout
setLayout(new BorderLayout());
// Create panel
JPanel grid = new JPanel();
grid.setLayout(new GridLayout(4, 4, 4, 4));
// Create font
Font font = new Font("SERIF", Font.BOLD, 32);
// Set Button Fonts and color
zero.setFont(font);
zero.setBackground(Color.cyan);
one.setFont(font);
one.setBackground(Color.cyan);
two.setFont(font);
two.setBackground(Color.cyan);
three.setFont(font);
three.setBackground(Color.cyan);
four.setFont(font);
four.setBackground(Color.cyan);
five.setFont(font);
five.setBackground(Color.cyan);
six.setFont(font);
six.setBackground(Color.cyan);
seven.setFont(font);
seven.setBackground(Color.cyan);
eight.setFont(font);
eight.setBackground(Color.cyan);
nine.setFont(font);
nine.setBackground(Color.cyan);
// add Buttons to grid
grid.add(zero);
grid.add(one);
grid.add(two);
grid.add(three);
grid.add(four);
grid.add(five);
grid.add(six);
grid.add(seven);
grid.add(eight);
grid.add(nine);
boolean edit = false;
JTextField numberBar = new JTextField();
numberBar.setSize(grid.WIDTH, 50);
numberBar.setEditable(edit);
// Add Number bar to panel
add(numberBar, BorderLayout.NORTH);
// Add grid to main panel
add(grid);
setTitle(name);
setSize(500, 500);
setVisible(true);
setDefaultCloseOperation(EXIT_ON_CLOSE);
}
@Override
public void actionPerformed(ActionEvent arg0) {
// TODO Auto-generated method stub
}
public static void main(String[] args) {
// TODO Auto-generated method stub
Calculator calculator = new Calculator("Calculator");
}
如您所见,如果没有ArrayList,这将是一个混乱的局面。请使用ArrayList
。使用myList.Add(myJButton)添加它们,并使用类似
for (JButton button : myList)
button.setBackground(Color.cyan);
ArrayList按钮
将是一个很好的开始..您甚至不需要ArrayList
-new按钮[10]
就可以了。或者List buttonList=new ArrayList()代码>只要试一下就可以了——如果有什么事情没有按预期工作,请随意询问。谷歌还将提供许多关于使用ArrayList
s的示例和教程。我刚刚在谷歌上搜索了“java使用ArrayList”,这是第一个结果。。。。