java.util.Arrays 类即为操作数组的工具类，包含了用来操作数组的各种方法。

目录

boolean equals(int[ ] a,int[ ] b)

String toString(int[ ] a)

void fill(int[ ] a,int val)

void sort(int[ ] a)

int binarySearch(int[ ] a,int key)

boolean equals(int[ ] a,int[ ] b)

import java.util.Arrays;

public class Test {
	public static void main(String[] args) {
		int[] arr1 = new int[]{1,2,3};
		int[] arr2 = new int[]{1,3,2};
		boolean isEquals = Arrays.equals(arr1, arr2);
		System.out.println(isEquals);
	}
}

>>> false

String toString(int[ ] a)

import java.util.Arrays;

public class Test {
	public static void main(String[] args) {
		int[] arr1 = new int[]{1,2,3};
		int[] arr2 = new int[]{1,3,2};
		System.out.println(Arrays.toString(arr1));
	}
}

>>> [1, 2, 3]

void fill(int[ ] a,int val)

import java.util.Arrays;

public class Test {
	public static void main(String[] args) {
		int[] arr1 = new int[]{1,2,3};
		int[] arr2 = new int[]{1,3,2};
		Arrays.fill(arr1, 5);
		System.out.println(Arrays.toString(arr1));
	}
}

>>> [5, 5, 5]

void sort(int[ ] a)

import java.util.Arrays;

public class Test {
	public static void main(String[] args) {
		int[] arr1 = new int[]{1,2,3};
		int[] arr2 = new int[]{1,3,2};
		Arrays.sort(arr2);
		System.out.println(Arrays.toString(arr2));
	}
}

>>> [1, 2, 3]

int binarySearch(int[ ] a,int key)

import java.util.Arrays;

public class Test {
	public static void main(String[] args) {
		int[] arr1 = new int[]{1,2,3};
		int[] arr2 = new int[]{1,3,2,-100,6,78,34,45,6};
		int index = Arrays.binarySearch(arr2, 34);
		if(index >= 0) {
			System.out.println(index);
		}else {
			System.out.println("未找到");
		}
	}
}

>>> 6