This chapter is from the book
This chapter is from the book
This chapter is from the book
Review Questions
3.13 What will the following program print when run?
public class ParameterPass { public static void main(String[] args) { int i = 0; addTwo(i++); System.out.println(i); } static void addTwo(int i) { i += 2; } }Select the one correct answer.
0
1
2
3
3.14 What will be the result of compiling and running the following program?
public class Passing { public static void main(String[] args) { int a = 0; int b = 0; int[] bArr = new int[1]; bArr[0] = b; inc1(a); inc2(bArr); System.out.println("a=" + a + " b=" + b + " bArr[0]=" + bArr[0]); } public static void inc1(int x) { x++; } public static void inc2(int[] x) { x[0]++; } }Select the one correct answer.
The code will fail to compile, since x[0]++; is not a legal statement.
The code will compile and will print a=1 b=1 bArr[0]=1 at runtime.
The code will compile and will print a=0 b=1 bArr[0]=1 at runtime.
The code will compile and will print a=0 b=0 bArr[0]=1 at runtime.
The code will compile and will print a=0 b=0 bArr[0]=0 at runtime.
3.15 Which statements, when inserted at (1), will result in a compile-time error?
public class ParameterUse { static void main(String[] args) { int a = 0; final int b = 1; int[] c = { 2 }; final int[] d = { 3 }; useArgs(a, b, c, d); } static void useArgs(final int a, int b, final int[] c, int[] d) { // (1) INSERT STATEMENT HERE. } }Select the two correct answers.
a++;
b++;
b = a;
c[0]++;
d[0]++;
c = d;
3.16 Which of the following method declarations are valid declarations?
Select the three correct answers.
void compute(int... is) { }
void compute(int is...) { }
void compute(int... is, int i, String... ss) { }
void compute(String... ds) { }
void compute(String... ss, int len) { }
void compute(char[] ca, int... is) { }
3.17 Given the following code:
public class RQ810A40 { static void print(Object... obj) { System.out.println("Object...: " + obj[0]); } public static void main(String[] args) { // (1) INSERT METHOD CALL HERE. } }Which method call, when inserted at (1), will not result in the following output from the program:
Object...: 9
Select the one correct answer.
print("9", "1", "1");
print(9, 1, 1);
print(new int[] {9, 1, 1});
print(new Integer[] {9, 1, 1});
print(new String[] {"9", "1", "1"});
print(new Object[] {"9", "1", "1"});
None of the above.