A New String

The pictures show what happens as the program runs. When the program starts there are two reference variables, but no objects. When the first statement executes,

String str = new String( "Golf is a good walk spoiled." ); // create the original object

it creates a String object and puts a reference to that object in the variable str. (The picture shows only the data part of the objects.)

When the second statement executes,

String sub = str.substring(8); //create a new object from the original

a new object is created that contains a substring of the characters in the first object. The variable sub is assigned a reference to this object.