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我目前正在制作一个需要 Spring Utilities 类的小型应用程序，该类扩展了“JPanel”，因为它是一个内容窗格，但是我需要通过容器获取布局类型，但只有这个类/框架正在使用spring 布局，它返回一个 EventQueue 异常（类 = https://docs.oracle.com/javase/tutorial/uiswing/examples/layout/SpringGridProject/src/layout/SpringUtilities.java）错误：

Exception in thread "AWT-EventQueue-0" java.lang.ArrayIndexOutOfBoundsException: No such child: 0
at java.awt.Container.getComponent(Unknown Source)
at dinges.Utilities.SpringUtilities.getConstraintsForCell(SpringUtilities.java:153)
at dinges.Utilities.SpringUtilities.makeCompactGrid(SpringUtilities.java:190)
at dinges.Containers.Addnew.<init>(Addnew.java:38)
at dinges.Containers.Listeners.AddListener.mousePressed(AddListener.java:27)
at java.awt.AWTEventMulticaster.mousePressed(Unknown Source)
at java.awt.Component.processMouseEvent(Unknown Source)
at javax.swing.JComponent.processMouseEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Window.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
at java.awt.EventQueue.access$500(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.awt.EventQueue$3.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue$4.run(Unknown Source)
at java.awt.EventQueue$4.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)

我认为这是由于这个

SpringUtilities.makeCompactGrid(this, 3, 2, 6, 6, 6, 6);

因为无法使用“this”，但我不确定该使用什么。

代码：

    package dinges.Containers;

import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.SpringLayout;

import dinges.Utilities.SpringUtilities;

@SuppressWarnings("serial")
public class Addnew extends JPanel {

    /**
     *  > Add a text input for the following:
     *  > Id, Name, last name, current balance, and the state. But this has to be in order of the new Account.
     *  > we're just going to be using JTextFields, a JButton for saving and JLabels for writing what it is
     * 
     **/

    public Addnew() {
        // frame size is WIDTH =   280     ,      HEIGHT =     480
        SpringLayout layout = new SpringLayout();
        setLayout(layout);

        JButton save = new JButton("Save data");
        JTextField name = new JTextField(15);
        JTextField lastname = new JTextField(15);
        JComboBox<String> accounttype = new JComboBox<String>();
        JLabel label1 = new JLabel("First name: ", JLabel.TRAILING);
        JLabel label2 = new JLabel("Last name: ", JLabel.TRAILING);
        JLabel label3 = new JLabel("Account type: ", JLabel.TRAILING);
        label1.setLabelFor(name);
        label2.setLabelFor(lastname);
        label3.setLabelFor(accounttype);

        SpringUtilities.makeCompactGrid(this, 3, 2, 6, 6, 6, 6);




        add(label1);
        add(label2);
        add(label3);
        add(save);
        add(name);
        add(lastname);
        add(accounttype);
    }

}

任何帮助都会很棒，并在此先感谢。

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1 回答 1

1

您需要先将组件添加到容器中。然后SpringUtilities.makeCompactGrid()在尝试布局现有组件时应用方法。因此，在所有执行完毕后，只需移动makeCompactGrid()到Addnew()构造函数的末尾即可。add()

附带说明一下，尽管 SpringLayout 非常灵活，但它的级别也很低，通常用于 GUI 构建，手动编写代码可能很麻烦。有关更多详细信息，请参阅如何使用 SpringLayout：

SpringLayout 是一个非常灵活的布局管理器，可以模拟其他布局管理器的许多特性。然而，SpringLayout 是非常低级的，因此您真的应该只将它与 GUI 构建器一起使用，而不是尝试手动编写 spring 布局管理器。

于 2016-08-04T18:39:41.170 回答