Java - String and array references

Question

Just started to learn Java, and saw that both string and array are reference types. I don\'t understand the following issue:

    String a = \"a1\";
    String b          


        

Answer 1

You have 3 string objects and 1 array object.
"a1", "a2", "rrr"
{1,2,3}

String a = "a1"; // a points to a new object "a1"
String b = "a2"; // b points to a new object "a2"
a=b; // a points to b's object "a2"
a = "rrr"; // a points to new object "rrr"

System.out.println(a); // prints "rrr" to console
System.out.println(b); // Prints "a2" to console

int[] arr1 = {1,2,3}; // arr1 points to new array {1,2,3}
int[] arr2 = arr1; // arr2 points to array in arr1 {1,2,3}
arr2[0]= 19; // modifies the array arr2 points to {19, 2, 3}
System.out.println(arr1[0]); // Prints "19" to console