javastring数组转long数组(javastring转数组的方法)

Introduction

When working with arrays in Java, it is common to need to convert between different data types. In particular, it is often necessary to convert a string array into a long array. In this article, we will explore how to perform this conversion in Java.

Converting a String Array to a Long Array

To convert a string array to a long array, we can use the Long.parseLong() method. This method takes a String as an argument and returns a long. We can use a loop to iterate over the string array, calling Long.parseLong() on each element and storing the returned value in a new long array.

Here is an example:

```
String[] stringArray = {"1","2","3","4","5"};
long[] longArray = new long[stringArray.length];

for (int i = 0; i < stringArray.length; i++) {
longArray[i] = Long.parseLong(stringArray[i]);
}
```

In this example, we first create a String array called stringArray with five elements. We then create a new long array with the same length as stringArray. We then loop over stringArray, calling Long.parseLong() on each element and storing the resulting long value in the corresponding index of longArray.

Handling Exceptions

It is important to note that Long.parseLong() can throw an exception if the input String is not a valid long value. Therefore, it is good practice to include error handling in our code.

We can use a try-catch block to handle the exception. Here is an example:

```
String[] stringArray = {"1","2","3","4","5"};
long[] longArray = new long[stringArray.length];

for (int i = 0; i < stringArray.length; i++) {
try {
longArray[i] = Long.parseLong(stringArray[i]);
} catch (NumberFormatException e) {
System.out.println(stringArray[i] + " is not a valid long value.");
}
}
```

In this example, we have added a try-catch block to handle the NumberFormatException that can be thrown by Long.parseLong(). If an exception is thrown, we print an error message indicating that the corresponding element is not a valid long value.

Conclusion

In this article, we have explored how to convert a string array to a long array in Java. We have seen how to use the Long.parseLong() method to perform the conversion, and we have discussed how to handle exceptions that may be thrown by this method. With this knowledge, we can handle string-to-long array conversions in Java with confidence.