正确遍历删除List中的元素方法(推荐)

遍历删除List中的元素有很多种方法，当运用不当的时候就会产生问题。下面主要看看以下几种遍历删除List中元素的形式：

1.通过增强的for循环删除符合条件的多个元素

2.通过增强的for循环删除符合条件的一个元素

3.通过普通的for删除删除符合条件的多个元素

4.通过Iterator进行遍历删除符合条件的多个元素

  public void listRemove() {
    List students = this.getStudents();
    for (Student stu : students) {
      if (stu.getId() == 2) 
 students.remove(stu);
    }
  }

  public void listRemoveBreak() {
    List students = this.getStudents();
    for (Student stu : students) {
      if (stu.getId() == 2) {
 students.remove(stu);
 break;
      }
    }
  }

  public void listRemove2() {
    List students = this.getStudents();
    for (int i=0; i



  public void iteratorRemove() {
    List students = this.getStudents();
    System.out.println(students);
    Iterator stuIter = students.iterator();
    while (stuIter.hasNext()) {
      Student student = stuIter.next();
      if (student.getId() % 2 == 0)
//这里要使用Iterator的remove方法移除当前对象，如果使用List的remove方法，则同样会出现ConcurrentModificationException
 stuIter.remove();
    }
    System.out.println(students);
  }


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

public class ListRemove {

  public static void main(String args[]) {
    ListRemove lr = new ListRemove();
    lr.listRemove();
    lr.listRemoveBreak();
//    lr.listRemove2();
//    lr.iteratorRemove();
  }

  
  public void listRemove() {
    List students = this.getStudents();
    for (Student stu : students) {
      if (stu.getId() == 2) 
 students.remove(stu);
    }
  }
  
  
  public void listRemoveBreak() {
    List students = this.getStudents();
    for (Student stu : students) {
      if (stu.getId() == 2) {
 students.remove(stu);
 break;
      }
    }
  }
  
  
  public void listRemove2() {
    List students = this.getStudents();
    for (int i=0; i students = this.getStudents();
    System.out.println(students);
    Iterator stuIter = students.iterator();
    while (stuIter.hasNext()) {
      Student student = stuIter.next();
      if (student.getId() % 2 == 0)
 stuIter.remove();
    }
    System.out.println(students);
  }
  
  private List getStudents() {
    List students = new ArrayList() {
      {
 int i = 0;
 while (i++ < 10) {
   Student student = new Student(i, "201200" + i, "name_" + i);
   this.add(student);
 }
      }
    };
    return students;
  }
}


public class Student {

  private int id;
  private String stuNo;
  private String name;
  
  public Student() {
    
  }
  
  public Student(int id, String stuNo, String name) {
    this.id = id;
    this.stuNo = stuNo;
    this.name = name;
  }

  public int getId() {
    return id;
  }

  public void setId(int id) {
    this.id = id;
  }

  public String getStuNo() {
    return stuNo;
  }

  public void setStuNo(String stuNo) {
    this.stuNo = stuNo;
  }

  public String getName() {
    return name;
  }

  public void setName(String name) {
    this.name = name;
  }

  @Override
  public String toString() {
    return "Student [id=" + id + ", name=" + name + ", stuNo=" + stuNo
 + "]";
  }
  
}

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