JAVA数组常用函数介绍及实例

JAVA 数组常用函数介绍及实例

import java.util.Arrays;

public class TestArray {public static void main(String[]args){int i,j;int []a=new int []{1,3,5,7,9};System.out .print("arrays a are ：");

for (i=0;i<5;i++)System.out .print(a[i]+","

);System.out .print("\n");

int key;

key=Arrays.binarySearch(a,7);/*查找关键字序号*/

System.out.print("the index of7is a"+key);/*数字7在a[?]*/

System.out.print("\n");

int[]b;

b=Arrays.copyOf(a,8);/*将数组a的值付给b，数组b长度为8，不足补0*/ System.out.print("arrays b are：");

for(i=0;i<8;i++)

System.out.print(b[i]+",");

System.out.print("\n");

System.out.print("a equals to b is"+Arrays.equals(a,b));

/*数组a与b是否相等？*/

System.out.print("\n");

int[]c=new int[5];

Arrays.fill(c,1);/*用1将数组c填满*/

System.out.print("arrays c are：");

for(i=0;i<5;i++)

System.out.print(c[i]+",");

System.out.print("\n");

int[]d=new int[]{1,8,2,7,3,6,4,5};

Arrays.sort(d);/*对数组d进行排序*/

System.out.print("arrays d after sorting：");

for(i=0;i<8;i++)

System.out.print(d[i]+",");

System.out.print("\n");

System.out.print("arrays d in strings:"+Arrays.toString(d));

/*对数组d以字符串形式输出*/

System.out.print("\n");

int[]e=new int[5];

System.arraycopy(d,3,e,0,5);

/*将数组d复制给数组e，从d的第3个元素开始，复制至e的第0个元素，复制长度为5;d的第3个元素为4，复制长度为5，所以复制元素为：4,5,6,7,8，复制到e的第0个到第4个元素*/

System.out.print("arrays e copied by d([3]-[7]):"+Arrays.toString(e));

}

}

程序输出：