Exception in thread " main" java. lang. NullPointerException: Cannot store to int array because "<lo

这个错误提示 "Exception in thread " main" java.lang.NullPointerException: Cannot store to int array because..." 表示你在 Java 程序中遇到了空指针异常 (NullPointerException)。当你尝试对一个 null 的 `int` 数组进行存储操作，比如添加元素或者访问数组成员，就会抛出这个异常。这通常是因为你在使用数组之前没有初始化它，或者是数组引用为 null。

解决这个问题的基本步骤包括：
1. 检查变量是否已经正确初始化：确保在使用数组前，数组已经被赋予非null的值，如通过 new 关键字创建一个新数组。
2. 使用条件语句检查：在进行数组操作前，检查数组是否为 null。
3. 写 try-catch 语句：捕获并处理可能出现的 NullPointer 异常。

例如：

int[] myArray = new int[10]; // 初始化数组
if (myArray != null) {
    myArray[0] = 5; // 正确操作不会抛出异常
} else {
    System.out.println("数组未初始化，无法存取");
}

相关问题

Exception in thread "main" java.lang.NullPointerException: Cannot read the array length because "<local2>" is null

This error message indicates that you are trying to read the length of an array that has not been initialized or is null. The variable "<local2>" is the array that is causing the error.

To fix this error, you need to make sure that the array is properly initialized before trying to access its length. You can do this by using the new keyword to create a new instance of the array with a specific size, or by assigning an existing array to the variable.

For example, if you want to create a new array of integers with a length of 10, you can do the following:

int[] myArray = new int[10];

This will create a new array with 10 elements, which you can then access and modify as needed.

If you are still having trouble with this error, you may need to check your code to make sure that all variables are properly initialized and that there are no other issues that could be causing the problem.