JAVA

java test if a string is a int

public static boolean isInt(String str) {
	
  	try {
      	@SuppressWarnings("unused")
    	int x = Integer.parseInt(str);
      	return true; //String is an Integer
	} catch (NumberFormatException e) {
    	return false; //String is not an Integer
	}
  	
}

java check if int

//"% (modulo)" calulates the remainder when the value on the left is divided by the value on the right

float number = 20;

if(number%1 == 0){
	println("It is an integer");
} else {
	println("It is not an integer");
}

determine if is string or int

string str = "3257fg";
for(int i = 0;i < (strlen(str) - 1);i++) {
    if((int)str[i] < 10) {
        // it is a number, so do some code
    } else {
        // it is not a number, do something else
    }
}

check if an int is a string java

try{
  int num = Integer.parseInt(str);
  // is an integer!
} catch (NumberFormatException e) {
  // not an integer!
}