Arrays类详解

package Base;

import java.util.Arrays;

public class Demon01 {

public static void main(String[] args) {
	// TODO Auto-generated method stub
	//Scanner scanner=new Scanner(System.in);
	int[] a= {1,2,3,4,9090,12345,543,21,3,23};
	System.out.println(a);//[I@15db9742
	//打印数组元素
	System.out.println(Arrays.toString(a));
	printArray(a);
	Arrays.parallelSort(a);//给数组排序
	System.out.println(Arrays.toString(a));
}
	public static void printArray(int[] a) {
		for(int i=0;i<a.length;i++) {
			if(i==0) {
				System.out.print("[");
			}
			if(i==a.length-1) {
				System.out.println(a[i]+"]");
			}else {
				System.out.print(a[i]+", ");
			}
		}
	}

}
输出结果：
[I@15db9742
[1, 2, 3, 4, 9090, 12345, 543, 21, 3, 23]
[1, 2, 3, 4, 9090, 12345, 543, 21, 3, 23]
[1, 2, 3, 3, 4, 21, 23, 543, 9090, 12345]