Difference in passing Array and Integer to a method in java?

I have started doing some programming in java and had the following question.

First, I am passing an integer to a method in java

public class testClass {

public static void main(String args[]){

int myInteger = 4; //Declaring a new integer and initializing to 4

change(myInteger); //Passing the integer to a method named change

System.out.println(myInteger); //Checking to see if the integer changed

}

public static void change(int x){

x+=5; //Adding 5 to the passed integer

}

}

When I run the above program, it prints out 4, which means the variable myInteger was not affected

Now I try to run the following code

public class testClass {

public static void main(String args[]){

int myArray[] = {4}; //Declaring a new Array and initializing to 4

change(myArray); //Passing the Array to a method named change

System.out.println(myArray[0]); //Checking to see if the Array changed

}

public static void change(int x[]){

x[0]+=5; //Adding 5 to the passed Array

}

}

When I run this code, it prints out 9. I am wondering why?

When I pass an integer to a method and returns nothing, the original integer variable is not affected. But when I do the same for an Array, the original array is affected. Can someone explain this?