To convert a string array to an int array in Java, you can use a loop to iterate over the elements of the string array, and use the Integer.parseInt method to parse each element into an int value.
Here is an example of how you can use a loop and the Integer.parseInt method to convert a string array to an int array in Java:
String[] stringArray = {"1", "2", "3"};
int[] intArray = new int[stringArray.length];
for (int i = 0; i < stringArray.length; i++) {
intArray[i] = Integer.parseInt(stringArray[i]);
}
This code defines a String array called stringArray and assigns it an array of strings, and then defines an int array called intArray with the same length as the stringArray. It then uses a for loop to iterate over the elements of the stringArray, and uses the Integer.parseInt method to parse each element into an int value, which is then stored in the corresponding element of the intArray.
The Integer.parseInt method takes a string as an argument and returns the equivalent int value. If the string cannot be parsed into an int value, the method will throw a NumberFormatException. You can catch this exception if you need to handle invalid input gracefully.
Note that the Integer.parseInt method only works for strings that contain numeric values in decimal format. If the string contains a numeric value in a different format, such as binary, octal, or hexadecimal, you will need to use a different method to parse the value.
For example, to parse a string that contains a binary number, you can use the Integer.parseInt method with the second argument set to 2, like this:
int value = Integer.parseInt("1010", 2);
This code parses the string "1010" as a binary number and returns the equivalent int value, which is 10.