Chapter 10.10, Problem 10.10.1CP

Suppose s1, s2, s3, and s4 are four strings, given as follows:

String s1 = “Welcome to Java”;

String s2 = s1;

String s3 = new String(“We1come to Java”);

String s4 = “Welcome to Java”;

What are the results of the following expressions?

a.    s1 == s2

b.    s1 == s3

c.    s1 == s4

d.    s1.equals(s3)

e.    s1.equals(s4)

f.    “Welcome to Java”.replace(“Java”, “HTML”)

g.    s1.replace(‘o’, ‘T’)

h.    s1.replaceAll(“o”, “T”)

i.    s1.rep1aceFirst(“o”, “T”)

j.    s1.toCharArray()