Netbeans告诉我一个值是布尔值，但它是int

Question

my while loop:

while (j =>0&& (courseArray[j].compareByCourse(value)) >=0 ){
}

在netbeans中给我这个错误:int cannot be converted to boolean

方法:

public static void insertionSort(Course[] courseArray){
    Course value ;   // the next value from the unsorted list to be inserted into the sorted list
    int i;     // i is a pointer to an item in the unsorted list
    int j;    // j is a pointer to an item in the sorted list; originally the sorted list is just a[0]
    int compare;
    for (i=1; i<courseArray.length; i++){
         value = courseArray[i];    
         j = i -1;
         compare = courseArray[j].compareByCourse(value);
         while (j =>0&& (courseArray[j].compareByCourse(value)) >=0 ){
         }
    }
}

compareByCourse方法:

//method to compare Courses by course name
int compareByCourse(Course other){
    return this.course.compareTo(other.getCourse());
}

j是int，返回值是int, 0是int，那么布尔值在哪里?

Answer 1

似乎您混淆了操作符>=与=> (这不是Java中的有效操作符)。尝试将while条件更改为:

while (j >= 0 && (courseArray[j].compareByCourse(value)) >= 0 )

如果你将j赋值给:

compare = courseArray[j].compareByCourse(value);

在while循环中使用(也可以直接使用)