Arrays工具类

public static void main(String[] args) {

int[] arr = {1994,1992,1993,1994,1995,1995,1997};

// 遍历输出

System.out.println(Arrays.toString(arr));

// 排序方法

Arrays.sort(arr);

System.out.println(Arrays.toString(arr));

// 二分法查找方法

int index = Arrays.binarySearch(arr, 1997);

System.out.println(index);

// arraycopy方法

int[] dest = {1996, 1998, 1999};

System.arraycopy(arr, 1, dest, 0 ,3);

System.out.println(Arrays.toString(dest));

// 复制数组

int[] newArr1 = Arrays.copyOf(arr, arr.length);

System.out.println(Arrays.toString(newArr1));

// 数组扩容

int[] newArr2 = Arrays.copyOf(arr, arr.length + 1);

System.out.println(Arrays.toString(newArr2));

// 缩小数组的容量

int[] newArr3 = Arrays.copyOf(arr, arr.length - 2);

System.out.println(Arrays.toString(newArr3));

// 填充数组

Arrays.fill(arr, 2000);

System.out.println(Arrays.toString(arr));

// 填充数组

Arrays.fill(arr, 1996, 1998, 1999);

System.out.println(Arrays.toString(arr));

int[] copyArr = Arrays.copyOfRange(arr, 1996, 1999);

System.out.println(Arrays.toString(copyArr));

int[] arr1 = {1994,1992,1993,1994,1995,1995,1997};

int[] arr2 = {1994,1992,1993,1994,1995,1995,1997};

System.out.println(Arrays.equals(arr1, arr2));

}

}

转载于:https://juejin.im/post/5cb60171e51d456e5977b166