java - 如何使两个数组随机相等

Question

我的项目的最后一部分是让两个测试数组 grades[] 和 grades2[] 随机相等以测试我的 equals 方法语句。如何正确使用 java.util.Random？或者如果有另一种方法，我很想听听......

在这段代码中，程序将永远输出两个对象不同(显然)，因为数组的内容是随机生成的。我如何使它们随机地彼此相等？

public class GradeBookClient
{
   public static GradeBook classRoom1, classRoom2;
   public static void main( String [] args )
   {  
     //Create two new arrays for testing the equals() method
     int[] grades = new int[100];
     int[] grades2 = new int[100]; 

     for ( int i = 0; i <= grades.length-1; i++ )
     {
         grades[i] = (int) Math.floor(Math.random()*101);
     }

     for ( int i = 0; i < grades2.length; i++ )
     {
         grades2[i] = (int) Math.floor(Math.random()*101);
     }



      classRoom1 = new GradeBook (grades);
      System.out.println( "The class size is " + classRoom1.getStudent() + " students." + "\n" + classRoom1.toString() ); 


      classRoom2 = new GradeBook (grades2);
      System.out.println( "The class size is " + classRoom2.getStudent() + " students." + "\n" + classRoom2.toString() );

      if ( classRoom1.equals( classRoom2 ))
      System.out.println("Classroom 1 has the same grades and class size as Classroom 2.");
      else
      System.out.println("Classroom 1 and Classroom 2 have different grades and class sizes.");
   }
}

Answer 1

这是矛盾的。如果它是随机的，你不能让它彼此相等。

编辑:如果你想创建两个随机填充的相同数组，那么你应该用随机数填充一个数组，然后用 System.arraycopy() 或类似的东西复制它。