java数组复制的四种方法效率对比

public static void arraycopy(Object src, 
               int srcPos, 
               Object dest, 
               int destPos, 
               int length) 

public class Main{ 
  public static void main(String[] args) { 
 
     int[] a1={1,2,3,4,5,6}; 
     int[] a2={11,12,13,14,15,16}; 
      
     System.arraycopy(a1, 2, a2, 3, 2); 
     System.out.print("copy后结果："); 
     for(int i=0;i<a2.length;i++){ 
       System.out.print(a2[i]+" ");   
     } 
  } 
} 

//被克隆的类要实现Cloneable接口 
class Cat implements Cloneable  
{
	private String name;
	private int age;
	public Cat(String name,int age) 
	  {
		this.name=name;
		this.age=age;
	}
	//重写clone()方法 
	protected Object clone()throws CloneNotSupportedException{
		return super.clone() ;
	}
}
public class Clone {
	public static void main(String[] args) throws CloneNotSupportedException {
		Cat cat1=new Cat("xiaohua",3);
		System.out.println(cat1);
		//调用clone方法 
		Cat cat2=(Cat)cat1.clone();
		System.out.println(cat2);
	}
}

Cat cat1=new Cat("xiaohua",3);//源对象 
    System.out.println("源对象地址"+cat1); 
    //调用clone方法，复制对象 
    Cat cat2=(Cat)cat1.clone(); 
    Cat cat3=(Cat)cat1;//复制引用 
    System.out.println("复制对象地址："+cat2); 
    System.out.println("复制引用地址："+cat3);