AP Computer Science A Unit 2: Using Objects

What is the output of the following code?

String s = "Hello World";
System.out.println(s.substring(6));

What is the output of the following code?

String s = null;
System.out.println(s.length());

What is the output of the following code?

String s = "Hello, World!";
System.out.println(s.length());

What is the output of the following code?

String s = "Java";
s = s.toUpperCase();
s = s + " rocks";
System.out.println(s);

What is the value of result after this code executes?

double result = Math.sqrt(Math.pow(3.0, 2) + Math.pow(4.0, 2));

What does the following code print?

String s = "programming";
System.out.println(s.substring(3, 7));

What is the output of the following code?

System.out.println(Math.abs(-7));
System.out.println(Math.pow(2, 3));

What is the output of the following code?

Integer a = 127;
Integer b = 127;
Integer c = 200;
Integer d = 200;
System.out.println(a == b);
System.out.println(c == d);

Which of the following correctly compares two String objects for equal content in Java?

String a = "hello";
String b = "hello";

What is printed by the following code?

String s = "  hello  ";
System.out.println(s.trim().toUpperCase().length());

What is the output of the following code?

String s = "abcdef";
System.out.println(s.indexOf("cd"));
System.out.println(s.indexOf("xy"));

What is the value of n after the following code executes?

int n = (int)(Math.random() * 6) + 1;