java中向JList添加滚动条的问题！急~~~

contentPane.add(jList1, new XYConstraints(72, 86, 213, 73))

这个地方应该添加的是listScrollPane而不是list

list.setSelectedIndex(int) 索引定位

list.setSelectedValue(obj, boolean)//值定位

import java.awt.Point

import javax.swing.JFrame

import javax.swing.JList

import javax.swing.JScrollBar

import javax.swing.JScrollPane

public class $ extends JFrame{

    public static void main(String[] args)  {

        $ $ = new $()

        $.setLayout(null)

        $.setSize(800, 600)

        $.setVisible(true)

        $.setResizable(false)

        $.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE)

        JList list = new JList()

        list.setListData(new String[]{"1", "2" ,"3", "3" ,"5","1", "2" ,"3", "3" ,"6"})

        JScrollPane jScrollPane = new JScrollPane(list)

        jScrollPane.setSize(100, 100)

        //list.setSelectedValue("5", true) //多个值相同时会导致无响应

        

        //索引

        int index = 9

        list.setSelectedIndex(index)

        Point p = list.indexToLocation(index)

        JScrollBar jScrollBar = jScrollPane.getVerticalScrollBar()//获得垂直滚动条  

        jScrollBar.setValue(p.y)//设置垂直滚动条位置  

        $.add(jScrollPane)

    }

}

import javax.swing.*

import java.awt.*

public class Frame1 extends JFrame {

JScrollPane jScrollPane1 = new JScrollPane()

JList jList1 = new JList()

public Frame1() {

try {

jbInit()

}

catch(Exception e) {

e.printStackTrace()

}

}

private void jbInit() throws Exception {

this.setLocale(java.util.Locale.getDefault())

this.getContentPane().setLayout(null)

jScrollPane1.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_NEVER)

jScrollPane1.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS)

jScrollPane1.setBounds(new Rectangle(141, 62, 89, 132))

this.getContentPane().add(jScrollPane1, null)

jScrollPane1.getViewport().add(jList1, null)

}

}

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