Arrays工具类的使用

import java.util.Arrays;

public class Arrays_Study {
    public static void main(String[] args) {
        int a[] = new int[]{12, 122, 332, 43, 445, 65, 7, 87, 98, 6};
        Arrays_Study.printArr(a);
        System.out.println("");
        Arrays.sort(a);
        Arrays_Study.printArr(a);
        System.out.println(Arrays.binarySearch(a, 445));
        int[] ints = Arrays.copyOf(a, 20);
        Arrays_Study.printArr(ints);
        Arrays.fill(ints,888);
        Arrays_Study.printArr(ints);
        boolean equals = Arrays.equals(a, ints);
        System.out.println(equals);
        int a1[] = new int[]{12, 122, 332, 43, 445, 65, 7, 87, 98, 6};
        System.out.println(Arrays.equals(a1, a));
    }

    public static void printArr(int a[]) {
        for (int i = 0; i < a.length; i++) {
            System.out.print(a[i] + " ");
        }
        System.out.println("");
    }
}

注意点：

1.对于Arrays里面的二分查找一定要先进行排序，然后再进行查找

2.Arrays.equals()比较的是数组里面的值是否相等，比较的不是地址，new出来的对象值要是相等的照样还是true。

public class Arrays_Study {
    public static void main(String[] args) {
        int a[] = new int[]{12, 122, 332, 43, 445, 65, 7, 87, 98, 6};
        int a1[] = new int[]{12, 122, 332, 43, 445, 65, 7, 87, 98, 6};
        System.out.println(Arrays.equals(a1, a));
    }

}