Chapter1

What will happen when you compile and run the following code?

}

}

• 1 will be printed out

• 2 will be printed out

• A compile time error will be generated

• An exception will be thrown

Which will be compiled

• double a = 100.0;

• double a = 100_.0;

• double a = 1_000.0;

• double a = _100.0;

Which will be compiled

• int val = null;

• int val = 1;

• int val = 1;

  int len = val.length();

• String val = "hello";

  int len = val.length();

Which will be compiled

• String main;

• String $val;

• String 1val;

• String const;

Which of the following legally fill in the blank so you can run the main() method from the command line?

public static void main(______)

• String _name []

• String [] 123

• String ... abc

• String [] $n

Which method declarations will enable a class to be run as a standalone program?

• static void main(String args[ ])

• public void static main(String args[ ])

• public static main(String[ ] argv)

• final public static void main(String [ ] array)

• public static void main(String args[ ])

What will the following code print when run? 

• Hello

• It will not print anything.

• It will not compile

• It will throw an Error at runtime.

• None of the above.

The options below contain the complete contents of a file. Which of these options can be run with the following command line once compiled? java main

• 
• 
• 
• 

Which of the following lines can be inserted at line 1 to make the program run?

(Assume that PrintWriter and OutputStreamWriter are valid classes in java.io package)

• import java.lang.*;

• import java.io.*;

• import java.io.OutputStreamWriter;

• include java.io.*;

Given the code in the picture

Which of the following commands will compile and then print "hello"?

• javac MyFirstClass

  java MyFirstClass hello hello

• javac MyFirstClass.java

  java MyFirstClass hello hello

•  

  javac MyFirstClass

  java MyFirstClass hello

   

• javac MyFirstClass.java

  java MyFirstClass hello