Question

我是编写Java的全新人选。我正在创建一个界面，收集该区域中所有互联网连接的列表。用户在其上选择一个，输入密码然后该人可以连接到密码。我的密码字段有问题...密码框是大的。

我该如何解决？这是代码。

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class Network_Interface
{
    JFrame frame;
    JPanel panel;

    public static void main (String[] args)
    {
        Network_Interface OBJECT_GUI = new Network_Interface();
        OBJECT_GUI.INIT();
    }

    public void INIT()
    {
        //frame and panel
        JFrame FRAME = new JFrame();
        JPanel PANEL = new JPanel();
        //init fields and labels
        JButton BUTTON_REFRESH = new JButton("Refesh List");
        JButton BUTTON_CONNECT = new JButton("Connect to network");
        JPasswordField  FIELD_PASSWORD = new JPasswordField(15);
        JLabel LABEL_PASSWORD = new JLabel("Enter Password of selected newtork.");
        JList LIST_NETWORKS = new JList(GET_NETWORKS());
        //event listeners
        BUTTON_REFRESH.addActionListener(new REFRESH_LISTENER());
        BUTTON_CONNECT.addActionListener(new CONNECT_LISTENER());
        //panel handling
        PANEL.setLayout(new BoxLayout(PANEL, BoxLayout.Y_AXIS));
        PANEL.add(LIST_NETWORKS);
        PANEL.add(BUTTON_REFRESH);
        PANEL.add(LABEL_PASSWORD);
        PANEL.add(FIELD_PASSWORD);
        PANEL.add(BUTTON_CONNECT);
        FRAME.getContentPane().add(BorderLayout.CENTER, PANEL);
        FRAME.setSize(500,500);
        FRAME.setVisible(true);
    }
    public String[] GET_NETWORKS()
    {
        //read file
        String[] ARRAY_NETWORKS= new String[2];
        ARRAY_NETWORKS[0] = "Frnkthtnk100";
        ARRAY_NETWORKS[1] = "CheesecakeFactory";
        return ARRAY_NETWORKS;
    }
    class REFRESH_LISTENER implements ActionListener
    {
        public void actionPerformed(ActionEvent EVENT)
        {
            //idk to do at this point
        }
    }
    class CONNECT_LISTENER implements ActionListener
    {
        public void actionPerformed(ActionEvent EVENT)
        {
            //IDk at this point
        }
    }
}

Answer 1

1）简单方法：将FRAME.setSize(500,500);替换为FRAME.pack();。它会将框架调整为组件的大小。但它会改变框架的大小。

2）如果你想保持帧大小，你可以指定JPasswordField FIELD_PASSWORD的最大大小，这样它就不会扩展到JPanel中的最大值。

JPasswordField FIELD_PASSWORD = new JPasswordField(15);
FIELD_PASSWORD.setMaximumSize(new Dimension(FIELD_PASSWORD.getMaximumSize().width, FIELD_PASSWORD.getMinimumSize().height));

JPasswordBox字段很大。我如何让它变小？

1 个答案: