Literals in java must be appended by which of these?

Literals in java must be appended by which of these?

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1) Which of these can not be used for a variable name in Java?

2) What is the output for the below code ?

public class Test
{
      public static void main(String[] args)
 { 
             int i = 010; 
             int j = 07; 
             System.out.println(i); 
             System.out.println(j); 
       } 
 }

3) Which of these values can a boolean variable contain?

4) Literal can be of which of these data types?

5) Java is a _______ language.