Java-GUI-AWT-组件-List类

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已于 2024-04-25 08:49:54 修改

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分类专栏： Java-进阶教程文章标签： java List

于 2022-06-02 12:26:20 首次发布

本文链接：https://blog.csdn.net/pwp032984/article/details/125098434

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本文详细介绍了Java中的List组件，特别是以List类为基础的classList实现，包括构造方法、常用操作和单选模式示例。通过MyItemListener展示了如何监听列表选择变化并更新UI。

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1 需求

2 接口

Class List

public class List extends Component implements ItemSelectable, Accessible

java.lang.Object
java.awt.Component
java.awt.List

Constructor Detail
public List() throws HeadlessException
public List(int rows) throws HeadlessException
public List(int rows, boolean multipleMode) throws HeadlessException
Method Detail
public void addNotify()
public void removeNotify()
public int getItemCount()
public String getItem(int index)
public String[] getItems()
public void add(String item)
public void add(String item, int index)
public void replaceItem(String newValue, int index)
public void removeAll()
public void remove(String item)
public void remove(int position)
public int getSelectedIndex()
public int[] getSelectedIndexes()
public String getSelectedItem()
public String[] getSelectedItems()
public Object[] getSelectedObjects()
public void select(int index)
public void deselect(int index)
public boolean isIndexSelected(int index)
public int getRows()
public boolean isMultipleMode()
public void setMultipleMode(boolean b)
public int getVisibleIndex()
public void makeVisible(int index)
public Dimension getPreferredSize(int rows)
public Dimension getPreferredSize()
public Dimension getMinimumSize(int rows)
public Dimension getMinimumSize()
public void addItemListener(ItemListener l)
public void removeItemListener(ItemListener l)
public ItemListener[] getItemListeners()
public void addActionListener(ActionListener l)
public void removeActionListener(ActionListener l)
public ActionListener[] getActionListeners()
public <T extends EventListener> T[] getListeners(Class<T> listenerType)
protected void processEvent(AWTEvent e)
protected void processItemEvent(ItemEvent e)
protected void processActionEvent(ActionEvent e)
protected String paramString()

3.X 示例：单选模式

import java.awt.*;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;

public class Test {
    Frame frame = new Frame("Choice");
    List list = new List(3);
    Label label = new Label();

    void init() {
        list.add("xxx");
        list.add("yyy");
        list.add("zzz");

        frame.add(list);

        frame.add(label, BorderLayout.SOUTH);

        frame.setBounds(100, 100, 300, 300);
        frame.setVisible(true);

        MyItemListener myItemListener = new MyItemListener();

        list.addItemListener(myItemListener);
    }

    class MyItemListener implements ItemListener {
        @Override
        public void itemStateChanged(ItemEvent e) {
            List list = (List) e.getItemSelectable();
            switch (list.getSelectedItem()) {
                case "xxx":
                    label.setText("xxx");
                    break;
                case "yyy":
                    label.setText("yyy");
                    break;
                case "zzz":
                    label.setText("zzz");
                    break;
                default:
                    break;
            }
        }
    }

    public static void main(String[] args) {
        new Test().init();
    }
}

4 参考资料