8.数组的几个常用方法

package com.atguigu.java;

public class code01 {
    public static void main(String[] args) {
        double[] list1 = new double[]{1, 2, 3, 4, 5};

        //1数组的遍历
        for (int i = 0; i < list1.length; i++) {
            System.out.print(list1[i] +" ");
        }

        //2.1找出数组中的最大值
        double max = list1[0];
        int indexOfMax = 0;
        for (int i = 1; i < list1.length; i++){
            if (list1[i] > max){
                max = list1[i];
                indexOfMax = i;
            }
        }
        System.out.println(max);//5.0
        System.out.println(indexOfMax);//4

        //2.2找出数组中的最小值
        double min = list1[0];
        int indexOfMin = 0;
        for (int i = 1; i < list1.length; i++){
            if (list1[i] < min){
                min = list1[i];
                indexOfMin = i;
            }
        }
        System.out.println(min);//1.0
        System.out.println(indexOfMin);//0

        //3打乱数组中的值
        for (int i = list1.length-1; i >0; i--){
            //随机生成一个下标 0 <= j <= i
            int j = (int)(Math.random()*(i-0+1));
            //交换list1[i] 和 list[j] 的值
            double temp = list1[i];
            list1[i] = list1[j];
            list1[j] = temp;
        }

        //遍历数组
        for (double e: list1){
            System.out.print(e + ",");
        }

        //4向前（向后）依次移动
        double t = list1[0];
        for (int i = 1; i < list1.length; i++){
            list1[i-1] = list1[i];
        }

        list1[list1.length - 1] = t;

        System.out.println();

        //5复制数组内容
        double[] list2 = new double[5];

        //5.1用循环语句逐个复制
        for (int i = 0; i < list1.length; i++){
            list2[i] = list1[i];
        }

        //5.2使用Sysyem类中的静态方法arraycopy
        System.arraycopy(list1,2,list2,0,3);

        //遍历list2
        for (double e: list2){
            System.out.print(e + ",");
        }


    }
}