利用Java迭代器删除list中元素
昨天晚上,老师问了一个问题:Java中怎么删除list中指定位置的元素,提示是用迭代器。简单实现如下:
import java.awt.List;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.LinkedList;
public class test {
static void printRemove(String str, int i){
System.out.println(str + i);
System.out.println("----------------Remove-------------");
}
static void printVerify(String str, int i){
System.out.println(str + i);
System.out.println("----------------Verify-------------");
}
public static void main(String[] args) throws Exception{
ArrayList<String> listTest = new ArrayList<String>();
LinkedList<String> ls = new LinkedList<String>();
listTest.add(0,"A");
listTest.add(1,"B");
listTest.add(2,"C");
listTest.add(3,"D");
ls.add("1");
ls.add("2");
ls.add("3");
ls.add("4");
int i = 0;
for (Iterator<String> iter = listTest.iterator(); iter.hasNext();i++) {
String str = (String)iter.next();
if(i%2!=0){
iter.remove();
printRemove(str,i);
}
printVerify(str,i);
}
for (Iterator<String> iter = listTest.iterator(); iter.hasNext();) {
System.out.println();
String str = (String)iter.next();
System.out.println(str);
}
for (Iterator<String> iter1 = ls.iterator(); iter1.hasNext();i++) {
String str = (String)iter1.next();
if(i%2!=0){
iter1.remove();
printRemove(str,i);
}
printVerify(str,i);
}
for (Iterator<String> iter = ls.iterator(); iter.hasNext();) {
System.out.println();
String str = (String)iter.next();
System.out.println(str);
}
}
}
简单实现了删除偶数位置的元素。
实现了功能,未考虑性能优化。