import java.util.Arrays;

public class Demo09 {


    public static void main(String[] args) {
        System.out.println("==============Arrays.sort()===============");
        int[] b = {1, 5, 9, 2, 7, 5};
        Arrays.sort(b);
        for (int i = 0; i < b.length; i++) {
            System.out.print(b[i] + " ");
        }
        System.out.println();
        System.out.println("==============Arrays.fill(int[] a, int val)===============");

        int[] c = {1, 5, 9, 2, 7, 5};
        Arrays.fill(c, 2);
        for (int i = 0; i < c.length; i++) {
            System.out.print(c[i] + " ");
        }
        System.out.println();
        System.out.println("==============Arrays.fill(int[] a, int fromIndex, int toIndex, int val)=============");
        int[] d = {1, 5, 9, 6, 7, 5};
        Arrays.fill(d, 2, 4, 2);
        for (int i = 0; i < d.length; i++) {
            System.out.print(d[i] + " ");
        }
    }
}

运行结果
==============Arrays.sort()===============
1 2 5 5 7 9 
==============Arrays.fill(int[] a, int val)===============
2 2 2 2 2 2 
==============Arrays.fill(int[] a, int fromIndex, int toIndex, int val)=============
1 5 2 2 7 5 
Process finished with exit code 0

Arrays工具类的使用