import java.applet.Applet;
import java.awt.Choice;
import java.awt.Label;
import java.awt.TextArea;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import java.io.File;
public class FileTest extends Applet implements ItemListener{
Label lb=new Label("请选择磁盘目录");
TextArea ta=new TextArea(20,10);
Choice txt=new Choice();
public void init(){
add(lb);
txt.addItem("C");
txt.addItem("D");
txt.addItem("E");
txt.addItem("F");
add(txt);
txt.addItemListener(this);
add(ta);
}
public void itemStateChanged(ItemEvent e) {
if(txt.getSelectedItem()=="C"){
File file1=new File("C:\\");
String[] q=file1.list();
for(int i=0;i<q.length;i++){
ta.setText(q[i]);
}
}
else if(txt.getSelectedItem()=="D"){
File file1=new File("D:\\");
String[] q=file1.list();
for(int i=0;i<q.length;i++){
ta.setText(q[i]);
}
}
else if(txt.getSelectedItem()=="E"){
File file1=new File("E:\\");
String[] q=file1.list();
for(int i=0;i<q.length;i++){
ta.setText(q[i]);
}
}
else{
File file1=new File("F:\\");
String[] q=file1.list();
for(int i=0;i<q.length;i++){
ta.setText(q[i]);
}
}
}
}
为什么不能将全部的指定磁盘下的目录输出?
请高手指教!!
import java.awt.Choice;
import java.awt.Label;
import java.awt.TextArea;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import java.io.File;
public class FileTest extends Applet implements ItemListener{
Label lb=new Label("请选择磁盘目录");
TextArea ta=new TextArea(20,10);
Choice txt=new Choice();
public void init(){
add(lb);
txt.addItem("C");
txt.addItem("D");
txt.addItem("E");
txt.addItem("F");
add(txt);
txt.addItemListener(this);
add(ta);
}
public void itemStateChanged(ItemEvent e) {
if(txt.getSelectedItem()=="C"){
File file1=new File("C:\\");
String[] q=file1.list();
for(int i=0;i<q.length;i++){
ta.setText(q[i]);
}
}
else if(txt.getSelectedItem()=="D"){
File file1=new File("D:\\");
String[] q=file1.list();
for(int i=0;i<q.length;i++){
ta.setText(q[i]);
}
}
else if(txt.getSelectedItem()=="E"){
File file1=new File("E:\\");
String[] q=file1.list();
for(int i=0;i<q.length;i++){
ta.setText(q[i]);
}
}
else{
File file1=new File("F:\\");
String[] q=file1.list();
for(int i=0;i<q.length;i++){
ta.setText(q[i]);
}
}
}
}
为什么不能将全部的指定磁盘下的目录输出?
请高手指教!!
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import java.io.File;public class FileTest extends Applet implements ItemListener{
Label lb = new Label("请选择磁盘目录");
TextArea ta = new TextArea(20,10);
Choice txt = new Choice(); public void init(){
add(lb);
txt.addItem("C");
txt.addItem("D");
txt.addItem("E");
txt.addItem("F");
add(txt);
txt.addItemListener(this);
add(ta);
} public void itemStateChanged(ItemEvent e){
if(txt.getSelectedItem() == "C"){
File file1 = new File("C:\\");
String[] q = file1.list();
for(int i = 0;i < q.length;i++){
ta.append(q[i]+"\n");
}
}else
if(txt.getSelectedItem() == "D"){
File file1 = new File("D:\\");
String[] q = file1.list();
for(int i = 0;i < q.length;i++){
ta.append(q[i]+"\n");
}
}else
if(txt.getSelectedItem() == "E"){
File file1 = new File("E:\\");
String[] q = file1.list();
for(int i = 0;i < q.length;i++){
ta.append(q[i]+"\n");
}
}else{
File file1 = new File("F:\\");
String[] q = file1.list();
for(int i = 0;i < q.length;i++){
ta.append(q[i]+"\n");
}
}
}
}