Java的JPanel（流式布局）添加到JScrollPane滚动窗格后垂直滚动条不正常且流式布局特点没了？求解答。

额，不知道这样是你要的不：
首先你的jscrollPane要这样设置：
JscrollPane.getHorizontalScrollBar().setAutoscrolls(false);
JscrollPane.getVerticalScrollBar().setAutoscrolls(true);
这样你的滚动条就只会显示竖线。
接下来是关键：
将jp.setlayout(new ModifiedFlowLayout());这个布局是继承flowlayout的。

也就是说将布局改为下面这个布局就可以了：

import java.awt.*;
public class ModifiedFlowLayout extends FlowLayout{
public ModifiedFlowLayout(){
super();
}
public ModifiedFlowLayout(int align){
super(align);
}
public ModifiedFlowLayout(int align,int hgap,int vgap){
super(align, hgap, vgap);
}
public Dimension minimumLayoutSize(Container target){
// Size of largest component, so we can resize it in
// either direction with something like a split-pane.
return computeMinSize(target);
}
public Dimension preferredLayoutSize(Container target){
return computeSize(target);
}
private Dimension computeSize(Container target){
synchronized(target.getTreeLock()){
int hgap = getHgap();
int vgap = getVgap();
int w = target.getWidth();
// Let this behave like a regular FlowLayout (single row)
// if the container hasn't been assigned any size yet
if(w ==0){
w =Integer.MAX_VALUE;
}
Insets insets = target.getInsets();
if(insets ==null){
insets =newInsets(0,0,0,0);
}
int reqdWidth =0;
int maxwidth = w -(insets.left + insets.right + hgap *2);
int n = target.getComponentCount();
int x =0;
int y = insets.top + vgap;// FlowLayout starts by adding vgap, so do that here too.
int rowHeight =0;
for(int i =0; i < n; i++){
Component c = target.getComponent(i);
if(c.isVisible()){
Dimension d = c.getPreferredSize();
if((x ==0)||((x + d.width)<= maxwidth)){
// fits in current row.
if(x >0){
x += hgap;
}
x += d.width;
rowHeight =Math.max(rowHeight, d.height);
}
else{
// Start of new row
x = d.width;
y += vgap + rowHeight;
rowHeight = d.height;
}
reqdWidth =Math.max(reqdWidth, x);
}
}
y += rowHeight;
y += insets.bottom;
return new Dimension(reqdWidth+insets.left+insets.right, y);
}
}
private Dimension computeMinSize(Container target){
synchronized(target.getTreeLock()){
int minx =Integer.MAX_VALUE;
int miny =Integer.MIN_VALUE;
boolean found_one =false;
int n = target.getComponentCount();
for(int i =0; i < n; i++){
Component c = target.getComponent(i);
if(c.isVisible()){
found_one =true;
Dimension d = c.getPreferredSize();
minx =Math.min(minx, d.width);
miny =Math.min(miny, d.height);
}
}
if(found_one){
return new Dimension(minx, miny);
}
return new Dimension(0,0);
}
}
}

可以贴代码吗？
这样看，不能很好的找到问题

JScrollPane，中放一个主PANEL，是流式布局

然后其它的JPanel添加到这个，主PANEL上是吗？