COMP SCI REVIEW!!!
String s = "apluscompsci"; System.out.println( s.indexOf( "z" ) );
-1
String s = "bog"; String r = "cog"; System.out.println( s.compareTo(r) );
-1
String s = "bob"; String r = "bod"; System.out.println( s.compareTo(r) );
-2
What is output by the code below? public class Check { private int one, two, total; public void setNums(int n1, int n2) { one = n1; two = n2; } public void add() { total = one + two; } public int getTotal() { return total; } } //code in the main of another class Check test = new Check(); test.setNums(3,-6); test.add(); out.println(test.getTotal());
-3
int x = "croc".length() - "crocodile".length(); System.out.println( x );
-5
System.out.println( Math.ceil(-6.7) );
-6.0
System.out.println( Math.floor(-6.7) );
-7.0
System.out.print(12.7 % 3);
.7
How many methods are there in class Aplus? public class Aplus { private int val; private double num; }
0
String s = "apluscompsci"; System.out.println( s.indexOf( "apluscompsci" ) );
0
String s = "dog"; String r = "dog"; System.out.println( s.compareTo(r) );
0
System.out.print( 0 / 7 );
0
System.out.print( 8 / 10 );
0
int x = 15; x = x % 5; System.out.print(x);
0
What is output by the code below? public class Aplus { private double num; public Aplus() { num = 0.0; } public double go() { return num; } public void fun( int x ) { num = num + x; } } //code in the main of another class Aplus test = new Aplus(); System.out.println(test.go());
0.0
System.out.print( (double) 1 / 2 );
0.5
How many accessor methods are there in class Aplus? public class Aplus { private double num; public Aplus() { num = 0.0; } public double go() { return num; } public void fun( int x ) { num = num + x;} }
1
How many constructors are there in class Check? public class Check { private int one, two, total; public void setNums(int n1, int n2) { one = n1; two = n2; } public void add() { total = one + two; } public int getTotal() { return total;' } }
1
How many instance variables are there in class Aplus? public class Aplus { private int val; }
1
How many methods are there in class Aplus? public class Aplus { private double num; public Aplus() { num = 0.0; } public double go() { return num; } }
1
How many modifier / mutator methods are there in class Check? public class Check { private int one, two, total; public void setNums(int n1, int n2) { one = n1; two = n2; } public void add() { total = one + two; } public int getTotal() { return total; } }
1
How many mutator / modifier methods are there in class Aplus? public class Aplus { private double num; public Aplus() { num = 0.0; } public double go() { return num; } public void fun( int x ) { num = num + x; } }
1
String s = "dog"; String r = "cog"; System.out.println( s.compareTo(r) );
1
System.out.print( 4 % 3);
1
System.out.print( 4 - 3 );
1
int x = "alligators".length() - "crocodile".length(); System.out.println( x );
1
System.out.print( (double) 2 / 2);
1.0
double x = .5 + .5; System.out.print(x);
1.0
double x = 4/3; System.out.print(x);
1.0
double x = 5/3.0; System.out.print(x);
1.66
System.out.println( Math.sqrt(100) );
10.0
System.out.print(3.0 / 6 + 3 * 3.5);
11.0
String s = "apluscompsci"; System.out.println( s.length() );
12
System.out.println( Math.round(11.634) );
12
Consider the class and client code below. public class Aplus { public double go( double a ) { return a * 3; } public double fun( double b ) { return go( b ) + b; } } //client code in another class Aplus x = new Aplus(); System.out.println( x.fun(3) );
12.0
int x = 12, y = 2; int z = x * y; double a = z/2; System.out.print(a);
12.0
String s = "12"; int x = Integer.parseInt( s ); System.out.println( s + x + 3 );
12123
System.out.println( "12" + 9 + 3 );
1293
String s = "12"; int x = Integer.parseInt( s ); System.out.println( x + 3 );
15
int x = 1 + 7 * 2; System.out.print(x);
15
String s = "12.7"; double x = Double.parseDouble( s ); System.out.println( x + 3 );
15.7
System.out.println( Math.min(Math.min(16,18),17) );
16
System.out.println( Math.pow( Math.sqrt(16),2) );
16.0
System.out.println( Math.max(Math.min(16,18),17) );
17
int x = 15; System.out.print( x + 2 );
17
How many instance variables are there in class Aplus? public class Aplus { private int val; private double num; }
2
How many methods are there in class Aplus? public class Aplus { private double num; public Aplus() { num = 0.0; } public double go() {return num; } public void fun( int x ) {num = num + x;} }
2
System.out.println( Math.round(7 / 3) );
2
System.out.println( Math.round(7.0 / 3) );
2
int x = 1 + 7 % 2; System.out.print(x);
2
int x = 4; x—; x—; System.out.print(x);
2
How many instance variables are there in class Check? public class Check { private int one, two, total; public void setNums(int n1, int n2) { one = n1; two = n2; } public void add() { total = one + two; } public int getTotal() { return total; } }
3
int x = 15; x/= 5; System.out.print(x);
3
What is output by the code below? public class Aplus { private double num;public Aplus() { num = 0.0; } public double go() { return num; } public void fun( int x ) { num = num + x; } } //code in the main of another class Aplus test = new Aplus(); test.fun( 3 ); System.out.println(test.go());
3.0
int x = 12, y = 20; int z = x + y; double a = z; System.out.print(a);
32.0
System.out.println( Math.pow(6,2) );
36.0
System.out.print( 3 % 4 + 1 * 3 % 2 );
4
System.out.print( 4 % 3 + 1 * 3);
4
System.out.println( (int)Math.pow( Math.sqrt(40),2) );
40
String s = "apluscompsci"; System.out.println( s.indexOf( "c" ) );
5
int x = 1; x *= 5; System.out.print(x);
5
int x = 4; x++; System.out.println(x);
5
int x = 5, y = 2; int z = x % y; double a = z * 5; System.out.println(a);
5.0
System.out.printf("%.3", 5.4517);
5.452
System.out.print( 8 - 4 + 2 );
6
Consider the class and client code below. public class Aplus { public double go( double a ) { return a * 3; } public double fun( double b ) { return go( b ) + b; } } //client code in another class Aplus x = new Aplus(); System.out.println( x.go(2) );
6.0
System.out.println( Math.floor(6.1) );
6.0
int x = 4; x *= 11 % 3; System.out.print(x);
8
System.out.println( Math.ceil(7.081) );
8.0
System.out.print( (int)9.6 );
9
System.out.print( 7 + 2 );
9
Consider the class and client code below. public class Aplus { public double go( double a ) { return a * 3; } public double fun( double b ) { return go( b ) + b; } } //client code in another class Aplus x = new Aplus(); System.out.println( x.go(3) );
9.0
System.out.println( Math.floor(9.687) );
9.0
Consider the method go below that should return the sum of the parameters a and b. public double go( double a, double b ) { /* blank */ } Which of the following could correctly fill /* blank */ ? I. return a + b; II. return a - b; III. return a * b;
I only
Consider the method go below that should return the perimeter of rectangle. The formula for perimeter of rectangle is :: 2 x length + 2 x width public double go( int len, int wid ) { /* blank */ } Which of the following could correctly fill /* blank */ ? I. return 2 * len * wid; II. return 2 * (len + wid); III. return 2 * len + 2 * wid;
II and III only
Consider the method go below that should return the difference of the parameters a and b. public double go( double a, double b ) { /* blank */ } Which of the following could correctly fill /* blank */ ? I. return a - b; II. return Math.abs(a - b); III. return a * b;
II only
Consider the method go below that should return twice the value of b minus the value of a. public double go( double a, double b ) { /* blank */ } Which of the following could correctly fill /* blank */ ? I. return b * b - a; II. return (2 * b) - a; III. return 2 * ( b - a );
II only
Consider the method go below that should return twice the value of a minus the value of b. public double go( double a, double b ) { /* blank */ } Which of the following could correctly fill /* blank */ ? I. return a * a - b; II. return 2 * a - b; III. return 2 * ( a - b );
II. return 2 * a - b;
Consider the method go below that should determine the value of a minus b and then return twice that value. public double go( double a, double b ) { /* blank */ } Which of the following could correctly fill /* blank */ ? I. return a * a - b; II. return 2 * a - b; III. return 2 * ( a - b );
III only
Consider the method go below that should return the perimeter of triangle. The formula for perimeter of a triangle is :: a + b + c public double go( int a, int b, int c ) { /* blank */ } Which of the following could correctly fill /* blank */ ? I. return abc; II. return a * b * c; III. return a + b + c;
III only
Consider the method go below that should return the product of the parameters a and b. public double go( double a, double b ) { /* blank */ } Which of the following could correctly fill /* blank */ ? I. return a + b; II. return a - b; III. return a * b;
III only
System.out.print( 7 / 0 );
There is no output due to a runtime error
String s = "12.7"; int x = Integer.parseInt( s ); System.out.println( x + 3 );
There is no output due to an error.
String s = "apluscompsci"; System.out.println( s.charAt(0) );
a
String s = "apluscompsci"; System.out.println( s.substring(0,1) );
a
String s = "apluscompsci"; int x = s.indexOf( "c" ); System.out.println( s.substring( x ) );
compsci
String s = "dog"; String r = s; s = null; System.out.println( r );
dog
String s = "dog"; String r = new String("dog"); System.out.println( s == r );
false
String s = "apluscompsci"; System.out.println( s.charAt( s.length()-1 ) );
i
String s = "apluscompsci"; System.out.println( s.substring( s.length()-1 ) );
i
String s = "dog"; String r = "dog"; s = null; System.out.println( s );
null
String s = "apluscompsci"; System.out.println( s.substring(1,2) );
p
The instance variables in class Aplus have what access? public class Aplus { private int val; private double num; }
private
String s = "apluscompsci"; System.out.println( s.substring( 9 ) );
sci
String s = "dog"; String r = "dog"; System.out.println( s.equals( r ) );
true
String s = "dog"; String r = new String("dog"); System.out.println( s.equals( r ) );
true
What is returned by the call myst("aplus","aplus")? public boolean myst(String a, String b) { return a.equals( b ); }
true
String s = "apluscompsci"; System.out.println( s.charAt(3) );
u
String s = "apluscompsci"; int x = 3; System.out.println( s.substring(x,x+1) );
u
