java - 无法理解为什么这一小段代码不起作用

Question

    int[] binArray = new int[100];
    int bins = 10; 
    int numOfIterations = 100/bins;
    int binElement = 0;
    for (int i=0; i<numOfIterations; i++) {
        binElement = binElement + bins;
        binElement = binArray[i];
        System.out.println(binArray[i]);
    }

继续打印:0000000000

尝试打印:0、10、20、30、40、50、60、70、80、90、100

Answer 1

你的问题是对数组赋值的误解

/* Commented below is your code with comments of what the code is doing */
//sets bin element to 10.
binElement = binElement + bins;
// binArray[i] is zero (by default), so all you do is set binElement back to zero.
binElement = binArray[i];
// You still have not updated the array so it prints the default int array value of zero.
System.out.println(binArray[i]);

将您的代码更改为下面发布的代码，它可以正确地将值分配给数组，您的问题就解决了:)

int[] binArray = new int[100];
int bins = 10; 
int numOfIterations = 100/bins;
int binElement = 0;
for (int i=0; i<numOfIterations; i++) {
    binElement = binElement + bins;
    binArray[i] = binElement ;
    System.out.println(binArray[i]);
}

查看下面发布的链接，了解有关如何为数组赋值的大量示例。

Arrays