答案:【计分规则】: public class TestPassByValue { public static void main(String[] args) { // Declare and initialize variables int num1 = 1; int num2 = 2; System.out.println("Before invoking the swap method, num1 is " +num1 + " and num2 is " + num2); swap(num1, num2); System.out.println("After invoking the swap method, num1 is " +num1 + " and num2 is " + num2); } public static void swap(int n1, int n2) { System.out.println("\tInside the swap method"); System.out.println("\t\tBefore swapping n1 is " + n1+ " n2 is " + n2); int temp = n1; n1 = n2; n2 = temp; System.out.println("\t\tAfter swapping n1 is " + n1 + " n2 is " + n2); }}