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藍森林 http://www.lslnet.com 2006年6月6日 10:18
 請高手指點程序錯在何處，該如何改？
import java.awt.*;
import java.io.*;
public class VFlowLayout implements LayoutManager,Serializable{
int hgap;
int vgap;
public VFlowLayout(){
this(5,5);
}
public VFlowLayout(int i,int j){
this.hgap=i;
this.vgap=j;
}
public void addLayoutComponent(String name,Component comp){
}
public void removeLayoutComponent(Component comp){
}
public Dimension preferredLayoutSize(Container container){
synchronized(container.getTreeLock()){
Dimension dimension1 =new Dimension(0,0);
int i=container.getComponentCount();
for(int j=0;JComponent component=container.getComponent(j);j++){
if(component.isVisible()){
Dimension dimension2 = component.getPreferedSize();
dimension1.width=Math.max(dimension1.width,dimension2.width);
if(j>;0)
dimension1.height += vgap;
dimension1.height += dimension2.height;
}
}
Insets insets=container.getInsets();
dimension1.height +=insets.top +insets.bottom +vgap*2;
dimension1.width +=insets.left +insets.right +hgap*2;
Dimension dimension= dimension1;
return dimension;
}
}
public Dimension minimumLayoutSize(Container container){
synchronized(container.getTreeLock()){
Dimension dimension1 =new Dimension(0,0);
int i=container.getComponentCount();
for(int j=0;j component component = container.getComponent(j);
if(component.isVisible()){
Dimension dimension2 = component.getMinimumSize();
dimension1.width=Math.max(dimension1.width,dimension2.width);
if(j>;0)
dimension1.height += vgap;
dimension1.height += dimension2.height;
}
}
Insets insets=container.getInsets();
dimension1.height +=insets.top +insets.bottom +vgap*2;
dimension1.width +=insets.left +insets.right +hgap*2;
Dimension dimension= dimension1;
return dimension;
}
}
public void layoutContainer(Container container){
synchronized(container.getTreeLock()){
Insets insets=container.getInsets();
int vSpace=container.getSize().height-(insets.top+insets.bottom+vgap*2);
int componentCount =container.getComponentCount();
int left =insets.left+hgap;
int totalHeight=0;
int width=0;
int componentStart=0;
for(int i=0;Jcomponent component=container.getComponent(i));
if(component.isVisible()){
Dimension dimension = component.getPreferredSize();
component.setSize(dimension.width,dimension.width);
if(totalHeight==0||totalHeight+dimension.height<=vSpace){
if(totalHeight>;0)
totalHeight +=vgap;
totalHeight +=dimension.height;
width =Math.max(width,dimension.width);
}else{
moveComponents(Container,insets.top+vgap,left,width,componentStart,i);
totalHeight=0;
left +=hgap +width;
width =dimension.width;
componentStart=i;
}
}
}
moveComponents(container,insets.top+vgap,left,width,componentStart,componentCount);
}
}
private void moveComponents(Container container,int top,int left,int width,int componentStart,int componentEnd){
synchronized(container.getTreeLock()){
for(int i=componentStart;JComponent component=container.getComponent(i))
if(component.isVisible()){
component.setLocation(left,top);
top+=component.getPreferedSize().height+vgap;
}
}
}
}
public void setHgap(int i){
this.hgap=i;
}
public void setVgap(int i){
this.vgap=i;
}
public int getHgap(){
return(this.hgap);
}
public int getVgap(){
return(this.vgap);
}
} |
請高手指點程序錯在何處，該如何改？
編譯錯，還是運行錯？ |
請高手指點程序錯在何處，該如何改？
是編譯錯，是一本JAVA入門教科書的例子，但就是編譯出錯。本人初學JAVA，菜鳥一個，還請高手指點，多謝了。錯誤提示如下：
VFlowLayout.java:29: ';' expected
for(int j=0;JComponent component=container.getComponent(j);j++){
^
VFlowLayout.java:53: ';' expected
for(int j=0;j component component = container.getComponent(j);
^
VFlowLayout.java:54: illegal start of expression
if(component.isVisible()){
^
VFlowLayout.java:61: ')' expected
}
^
VFlowLayout.java:71: 'class' or 'interface' expected
public void layoutContainer(Container container){
^
VFlowLayout.java:100: 'class' or 'interface' expected
}
^
VFlowLayout.java:134: 'class' or 'interface' expected
^
7 errors |
請高手指點程序錯在何處，該如何改？
你自己手工輸入的？感覺很多地方都完全違反Java的語法：
我改成這樣了：
[code]
import java.awt.Component;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.Insets;
import java.awt.LayoutManager;
import java.io.Serializable;
public class VFlowLayout implements LayoutManager, Serializable {
int hgap;
int vgap;
public VFlowLayout() {
this(5, 5);
}
public VFlowLayout(int i, int j) {
this.hgap = i;
this.vgap = j;
}
public void addLayoutComponent(String name, Component comp) {
}
public void removeLayoutComponent(Component comp) {
}
public Dimension preferredLayoutSize(Container container) {
synchronized (container.getTreeLock()) {
Dimension dimension1 = new Dimension(0, 0);
int i = container.getComponentCount();
for (int j = 0; j < i; j++) {
Component component = container.getComponent(j);
if (component.isVisible()) {
Dimension dimension2 = component.getPreferredSize();
dimension1.width = Math.max(dimension1.width,
dimension2.width);
if (j >; 0)
dimension1.height += vgap;
dimension1.height += dimension2.height;
}
}
Insets insets = container.getInsets();
dimension1.height += insets.top + insets.bottom + vgap * 2;
dimension1.width += insets.left + insets.right + hgap * 2;
Dimension dimension = dimension1;
return dimension;
}
}
public Dimension minimumLayoutSize(Container container) {
synchronized (container.getTreeLock()) {
Dimension dimension1 = new Dimension(0, 0);
int i = container.getComponentCount();
for (int j = 0; j < i; j++) {
Component component = container.getComponent(j);
if (component.isVisible()) {
Dimension dimension2 = component.getMinimumSize();
dimension1.width = Math.max(dimension1.width,
dimension2.width);
if (j >; 0)
dimension1.height += vgap;
dimension1.height += dimension2.height;
}
}
Insets insets = container.getInsets();
dimension1.height += insets.top + insets.bottom + vgap * 2;
dimension1.width += insets.left + insets.right + hgap * 2;
Dimension dimension = dimension1;
return dimension;
}
}
public void layoutContainer(Container container) {
synchronized (container.getTreeLock()) {
Insets insets = container.getInsets();
int vSpace = container.getSize().height
- (insets.top + insets.bottom + vgap * 2);
int componentCount = container.getComponentCount();
int left = insets.left + hgap;
int totalHeight = 0;
int width = 0;
int componentStart = 0;
for (int i = 0; i < componentCount; i++) {
Component component = container.getComponent(i);
if (component.isVisible()) {
Dimension dimension = component.getPreferredSize();
component.setSize(dimension.width, dimension.width);
if (totalHeight == 0
|| totalHeight + dimension.height <= vSpace) {
if (totalHeight >; 0)
totalHeight += vgap;
totalHeight += dimension.height;
width = Math.max(width, dimension.width);
} else {
moveComponents(container, insets.top + vgap, left,
width, componentStart, i);
totalHeight = 0;
left += hgap + width;
width = dimension.width;
componentStart = i;
}
}
}
moveComponents(container, insets.top + vgap, left, width,
componentStart, componentCount);
}
}
private void moveComponents(Container container, int top, int left,
int width, int componentStart, int componentEnd) {
synchronized (container.getTreeLock()) {
int count = container.getComponentCount();
for (int i = componentStart; i < count; i++) {
Component component = container.getComponent(i);
if (component.isVisible()) {
component.setLocation(left, top);
top += component.getPreferredSize().height + vgap;
}
}
}
}
public void setHgap(int i) {
this.hgap = i;
}
public void setVgap(int i) {
this.vgap = i;
}
public int getHgap() {
return (this.hgap);
}
public int getVgap() {
return (this.vgap);
}
}
[/code] |
請高手指點程序錯在何處，該如何改？
真不愧是大法師，編譯通過了，多謝版主指點！
但是運行時還是有問題：
D:\>;appletviewer VFlowLayout.html
java.lang.ClassCastException
at sun.applet.AppletPanel.createApplet(Appl
at sun.applet.AppletPanel.runLoader(AppletP
at sun.applet.AppletPanel.run(AppletPanel.j
at java.lang.Thread.run(Thread.java:534)
還請版主指點該如何運行。
其中 VFlowLayout.html為
<html>;
<head>;
<title>;
first Applet
</title>;
</head>;
<body>;
<applet code="VFlowLayout.class" WIDTH=500 HEIGHT=500>;
</applet>;
</body>;
</html>; |
請高手指點程序錯在何處，該如何改？
這個代碼不是Applet，不能當Applet來用 |
請高手指點程序錯在何處，該如何改？
感謝版主指點迷津！ :em02: |
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