System.arraycopy(src, srcPos, dest, destPos, length);
src:要被復制的數(shù)組
srcPos:被復制的數(shù)組的開始位置
dest:要復制的數(shù)組
destPos要:復制的數(shù)組的開始位置
length:復制的長度

package com.array;

public class TestArrayCopy {

    public static void main(String[] args) {
        String[] str={"1","2","3","4","5","6","7"};
        String[] str2={"8","9","10"};
        removeElement(str,1);
        System.out.println("removeElement方法####################");
        extendRange(str);
        System.out.println("extendRange方法#######################");
        addElement(str,1,str2);
    }

    //刪除元素
    public static String[] removeElement(String[] s,int index){     
        
        System.arraycopy(s,index+1,s,index,s.length-index-1);
        s[s.length-1]=null;
        for(int i=0;i<s.length;i++){
            System.out.println(i+"---"+s[i]);
        }
        return s;
    }
    
    //拓展數(shù)組長度
    public static String[] extendRange(String[] s1){
        String[] s2=new String[s1.length+20];
        System.arraycopy(s1, 0, s2, 0, s1.length);
        for(int i=0;i<s2.length;i++){
            System.out.println(i+"---"+s2[i]);
        }
        return s2;
    } 
    
    //在數(shù)組指定位置插入數(shù)組或元素
    public static String[] addElement(String[] s1,int index,String[] s2){
        
        String[] s3=new String[s1.length+s2.length];
        System.arraycopy(s1, 0, s3, 0, s1.length);
        
        String[] s4=new String[s3.length];
        System.arraycopy(s3,index, s4, 0, s3.length-s2.length-index);
        for(int i=0;i<s3.length-s2.length-index;i++){
            s3[index+i+3]=s4[i];    
        }
        
        System.arraycopy(s2, 0, s3, index, s2.length);
        //s3[6]="9";
        //for(int i=0;i<s4.length;i++){
        //  System.out.println(i+"---"+s4[i]);
        //  }
        //System.out.println("#################");
        for(int i=0;i<s3.length;i++){
        System.out.println(i+"---"+s3[i]);
        }
        return s3;
    }
}