Java中的Arrays类

替换
import java.util.Arrays;

public class Arrays01替换 {
    public static void main(String[] args) {
        int arr1[]={6,4,5,2,1,3};
        Arrays.fill(arr1,7);
        for (int i=0;i<arr1.length;i++){
            System.out.println(arr1[i]);
        }

    }
}
排序
import java.util.Arrays;

public class 排序 {public static void main(String[] args) {
    int arr1[]={6,4,5,2,1,3};
    Arrays.sort(arr1);
    char arr2[]={'b','d','c','a'};
    Arrays.sort(arr2);
    for (int i=0;i<arr1.length;i++){
        System.out.println(arr1[i]);
    }
    for (int i=0;i<arr2.length;i++){
        System.out.println(arr2[i]);
    }
}
}
判断两个数组是否相等
import java.util.Arrays;

public class 判断两个数组是否相等 {
    public static void main(String[] args) {
        int arr1[]={1,2,3};
        int a[]={1,2,3};
        System.out.println(Arrays.equals(arr1,a));
        char arr2[]={'a','b','c'};
        char b[]={'A','b','c'};
        System.out.println(Arrays.equals(arr2,b));
    }
}
拷贝
import java.util.Arrays;

public class 拷贝数组 {
    public static void main(String[] args) {
        int[]arr1={1,2,3,4,5};
        int[]c= Arrays.copyOf(arr1,2);
        for (int i=0;i<c.length;i++){
            System.out.println("数组c是："+c[i]);
        }
        int[]d= Arrays.copyOf(arr1,6);
        for (int i=0;i<d.length;i++){
            System.out.println("数组d是："+d[i]);
        }
    }
}
打印数组
import java.util.Arrays;

public class 打印数组 {
    public static void main(String[] args) {
        int[]arr1={1,2,3,4,5};
        char arr2[]={'a','b','c'};
        System.out.println(Arrays.toString(arr1));
        System.out.println(Arrays.toString(arr2));
    }
}