java8中的stream对List的一些操作

package com.fh;

public class Student {
    
    private String age;
    private Integer sex;
    public String getAge() {
        return age;
    }
    public void setAge(String age) {
        this.age = age;
    }
    public Integer getSex() {
        return sex;
    }
    public void setSex(Integer sex) {
        this.sex = sex;
    }
    
    
    

}

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