如何洗牌数组列表

我需要一些帮助，在编写一个方法，将洗牌的数组列表。我不知道该在我的方法中加入什么。这是我目前掌握的情况。我尝试使用随机方法对列表中的整数进行随机化，但是没有用。有人能告诉我怎么做吗？

下面是我试过的代码:

import java.util.ArrayList;
import java.util.Scanner;


public class Lab 11 {
public static void main(String[] args) {
ArrayList<Double> list = new ArrayList<Double>();


Scanner input = new Scanner(System.in);
System.out.print("Enter integers (input ends with 0): ");
double value;


do {
value = input.nextDouble(); // Read a value from the input


if (value != 0)
list.add(value); // Add the value if it is not in the list
} while (value != 0);
System.out.println("The maximum number is " + max(list));


System.out.print("Enter five double values: ");
for (int i = 0; i < 5; i++)
list.add(input.nextDouble());


System.out.println("The sum is " + sum(list));


}


public static Double max(ArrayList<Double> list) {
if (list == null || list.size() == 0)
return null;


double result = list.get(0);
for (int i = 1; i < list.size(); i++)
if (result < list.get(i))
result = list.get(i);


return result;
}


public static double sum(ArrayList<Double> list) {
double sum = 0;
for (int i = 0; i < list.size(); i++)
sum += list.get(i);
return sum;
}
}