package com.chinaops.web.console.remote.servlet;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
public class ListRemoveTest {
public static void main(String[] args) {
ListRemoveTest test = new ListRemoveTest();
System.out.println("-1-使用jdk5.0以后的增强for循环去remove");
List<String> list = test.buildList();
try {
for (String str : list) {
list.remove(str);
}
} catch (Exception e) {
// java.util.ConcurrentModificationException
e.printStackTrace();
}
System.out.println("-2-使用Iterator的remove");
list = test.buildList();
try {
Iterator<String> iterator = list.iterator();
while (iterator.
hasNext()) {
iterator.remove();
}
} catch (Exception e) {
// java.lang.IllegalStateException
e.printStackTrace();
}
System.out.println("-3-iterator遍历+list的remove");
try {
list = test.buildList();
for (Iterator iterator = list.iterator(); iterator.hasNext();) {
String str = (String) iterator.next();
list.remove(str);
}
} catch (Exception e) {
// java.util.ConcurrentModificationException
e.printStackTrace();
}
System.out.println("-4-使用list的remove(int)方法. [由后向前删除]");
list = test.buildList();
for (int i = list.size(); i > 0; i--) {
list.remove(i - 1);
}
System.out.println("-5-使用list的remove(int)方法. [由前向后删除]");
list = test.buildList();
for (int i = 0; i < list.size(); i++) {
list.remove(0);
}
System.out.println("-6-iterator遍历+list的iterator.remove");
try {
list = test.buildList();
for (Iterator iterator = list.iterator(); iterator.hasNext();) {
String str = (String) iterator.next();
iterator.remove();//在iterator中应该这样删除
}
} catch (Exception e) {
e.printStackTrace();
}
}
private List<String> buildList() {
List<String> list = new ArrayList<String>();
list.add("a");
list.add("b");
list.add("c");
return list;
}
}