Question

Decisions in Java – Comparing Strings WS

1. For each of the following pairs of strings, state, with reasons, which string precedes the other.

(a) "cat" and "dog" (b) "cat" and "Cathy" (c) "X " and " X"

(d) "cab" and "car" (e) "XX" and "X X" (f) "XY" and "XY " (g) "375" and "84" (h) "" and " "

2. State the value of each expression.

(a) "one".equals("one ")

(b) (b) "two".equals("2")

(c) "Three".equals("Three")

(d) "four".equals("for")

3. State whether the value of the expression is negative, zero, or positive.

(a) "for".compareTo("fore")

(b) "fore".compareTo("force") (c) "force".compareTo("Force") (d) "Force".compareTo("Farce") (e) "Farce".compareTo("Fare") (f) "Fare".compareTo("far")

(g) "far".compareTo("far")

(h) "far".compareTo("far ")

Answer 1

1. use compareTo() method

(a) "cat" and "dog" ----- cat, c is smaller than d

(b) "cat" and "Cathy" ---- Cathy, C is smaller than c

(c) "X " and " X" --- " X", space is smaller than X

(d) "cab" and "car" ---- cab, b is smaller than r

(e) "XX" and "X X" ---"X X"

(f) "XY" and "XY " --- "XY"

(g) "375" and "84" ---- "375", 3 is smaller than 8

(h) "" and " " ------ ""

2. State the value of each expression.

(a) "one".equals("one ") ------- false, difference of space ()

(b) (b) "two".equals("2") ---------- false

(c) "Three".equals("Three")-------- true, all characters in the strings are same

(d) "four".equals("for")------------ false

3.

(a) "for".compareTo("fore")---- -1, small and larger string

(b) "fore".compareTo("force") --- 2 , difference between c and e

(c) "force".compareTo("Force") ---- 32, difference between F and f

(d) "Force".compareTo("Farce") ---- 14, difference between o and a

(e) "Farce".compareTo("Fare") --- -2, difference between c and e

(f) "Fare".compareTo("far") --- -32, difference between F and f

(g) "far".compareTo("far") ----- 0 , both are equal

(h) "far".compareTo("far ") ----- -1, small and larger string

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