Draw contour diagrams to show the state of execution after the execution of the following code segment: String s1, s2, s3, s4; s1 ¼ new String("stirrup irons"); s2 ¼ "stirrup irons"; s3 ¼ new...

Draw contour diagrams to show the state of execution after the execution of the

following code segment:

String s1, s2, s3, s4;

s1 ¼ new String("stirrup irons");

s2 ¼ "stirrup irons";

s3 ¼ new String("stirrup irons");

s4 ¼ s2;