1. Which of the following are valid method calls? Select all valid method calls given:

Select one or more:

a.

s.isDigit();

b.

Character.toUpperCase(c);

c.

'c'.length();

d.

c.length();

e.

c.toLowerCase();

f.

c.isDigit();

g.

s.toUpperCase();

h.

"s".length();

i.

Character.isDigit(c);

2.

Which of the following are valid methods? Select all methods that correctly use return statements and would compile.

Select one or more:

a.

public static int maxA(int x, int y) { if (x > y) { return x; } return y; }

b.

public static int maxC(int x, int y) { if (x > y) { return x; } else { return y; } return y; } 

c.

public static String methodA(int place) { if (place == 1) { return "first"; } else if (place == 2) { return "second"; } else if (place == 3) { return "third"; } } 

d.

 public static int indexOfA(char ch, String s) { for (int i = 0; i < s.length(); i++) { if (s.charAt(i) == ch) { return i; } } return -1; } 

e.

 public static int maxB(int x, int y) { if (x > y) { return x; } else { return y; } } 

f.

 public static int indexOfB(char ch, String s) { int ret = -1; for (int i = s.length() - 1; i >= 0; i--) { if (s.charAt(i) == ch) { ret = i; } } return -1; }