java100-集合类简介

//集合类的作用
public class test35 {
private String name;
private int num;
private int grade;

public test35(String name,int num,int grade){
this.name=name;
this.num=num;
this.grade=grade;
}

public String getName() {
return name;
}

public int getGrade() {
return grade;
}

public int getNum() {
return num;
}
}
测试import java.util.ArrayList;
public class test36 {
public static void main(String[] args){
ArrayList aa1=new ArrayList();
//当前对象个数
System.out.println("原始的对象个数为"+aa1.size());
test35 xs1=new test35("歌谣",3,4);
aa1.add(xs1);
System.out.println("现在的对象个数为"+aa1.size());
}
}