java--集合迭代删除

package com.test;

import java.util.ArrayList;
import java.util.Iterator;

import com.bean.Student;

public class Generic {

public static void main(String[] args) {
	ArrayList<String> list =new ArrayList<>();
	list.add("a");
	list.add("a");
	list.add("b");
	list.add("b");
	list.add("b");
	//extracted(list);
	//extracted_1(list);
	//extracted_2(list);
	
}

private static void extracted_2(ArrayList<String> list) {
	for (Iterator<String> it= list.iterator(); it.hasNext();) {		//迭代删除for
		if("b".equals(it.next())) {
			it.remove();	//不能用集合的方法删除(list.remove("b"))
		}
	}System.out.println(list);
}

private static void extracted_1(ArrayList<String> list) {
	Iterator<String> it = list.iterator();	//迭代删除while
	while(it.hasNext()) {
		if("b".equals(it.next())) {
			it.remove();	//不能用集合的方法删除(list.remove("b"))
		}
	}System.out.println(list);
}

private static void extracted(ArrayList<String> list) {  //普通循环删除for （注：增强for循环不能删除）
	for(int i=0;i<list.size();i++) {
		if("b".equals(list.get(i))) {
			list.remove(i);
		}
	}System.out.println(list);
}

}