java - 在数组中搜索特定值

Question

这个问题已经有答案了:

How do I determine whether an array contains a particular value in Java? (31 个回答)

已关闭 7 年前。

所以这是我的困境，我试图在数组中搜索特定值，但我收到一个错误，我不知道如何修复。这是我当前的代码:

import java.util.Arrays;

public class Marathon {

public static void main(String[] args)  {

    double[]    weeks = {2,4.66,7.33,10,12.66,15.33,18,20.66,23.33,26};
    double sum = 0;
    int length = weeks.length;

    for (double i : weeks)
        sum += i;

    System.out.println("What is the value for array element 2: " + weeks[1]);
    System.out.println("What is the list length: " + length);
    System.out.println("Sum of all miles run during the 10 week period: " + sum);
    System.out.println("Does the list contain a week with 4 miles: ");

    boolean retval = weeks.contains(4.00);
    if (retval == true) {
        System.out.println("10 is contained in the list");
       }
      else {
        System.out.println("10 is not contained in the list");
       }
    }
}

我收到的错误消息如下:

Cannot invoke contains(double) on the array type double[]   
Marathon.java/do while/src  line 18 Java Problem

对此的任何帮助将不胜感激!提前致谢。

Answer 1

您可以使用 Java 8 来做到这一点:

boolean retval = DoubleStream.of(weeks).anyMatch(i->i==10.0);

它将 double 组转换为 DoubleStream。然后，它将流与谓词进行匹配，例如 i 等于 10.0。

希望对您有所帮助。