Javase 集合
阿新 • • 發佈:2018-05-29
method this public 引用 pri int ride ide pre
package Swxx; public class Person { private String name; private int age; public Person(String name, int age) { super(); this.name = name; this.age = age; } public String getName() { return name; } public void setName(String name) { this.name = name; } public int getAge() { return age; } public void setAge(int age) { this.age = age; } @Override public String toString() { return "Person [name=" + name + ", age=" + age + "]"; } }
package Swxx; import java.util.ArrayList; public class Xue { public static void main(String[] args) { method2(); } public static void method1(){ // 主要:集合中只能存放引用數據類型 //之所以集合中可以存放int類型的值是因為JDK5以後的自動裝箱的特性 ArrayList<Integer> List=new ArrayList<Integer>(); List.add(1); List.add(2); //集合遍歷(兩種方式) for(int i:List){ System.out.println(i); } for(int i=0;i<List.size();i++){ //[i]和length是數組,,get(i)和。size是集合 System.out.println(List.get(i)); } } public static void method2(){ ArrayList<Person> list=new ArrayList<Person>(); list.add(new Person("後裔",28)); list.add(new Person("李元芳",18)); list.add(new Person("韓信",20)); for(Person p:list){ System.out.println(p.getName()+"..."+p.getAge()); //引用對象打印默認調用toString System.out.println(p); } } }
Javase 集合