Question

True or false 27. Java compiler does not ignore white spaces such as spaces, tabs, or blank lines in a Java program. 28. The same variable name(s) can be declared and used within different methods. 29. In Java, 3*'b'+1 is a valid expression. 30. In Java x++ is equivalent to x=x+1. 31. In Java, int x-2.5; is a valid statement. 32. The data type of the Java expression (int) 2.5 is double. 33. A method in Java can return more than one value. 34. A method can take more than one parameter. 35. In Java, 3+"abc"+2*3 is a valid statement. 36. Method A can call another method B which in turn calls the method A again in Java 37. More than two for loops can be nested within each other 38. In Java, if a=4, b6, then statements a=b; and b=a; will produce the result that a=6 and b=4. 39. Identifier_$ is valid in Java. 40. Java bytecode for the same program is different for different platform.

Answer 1

27. False, Java compiler ignores spaces, tabs etc. That is why the code easily readable and understandable.

28.True, we can use same variable names inside different functions.

29.True, 3*'b'+1 gives 295. This expression is considered as 3*98+1 as b's ASCII value is 98.

30.True

31.False, most of the compilers will through an error. Even if any compiler accepts the statement the integer value will be taken as 2.

32.False, (int)2.5 means we are type casting the double to int. So the data type eventually will becomes as an int.

33.False, A method in Java can return only one value, it can be a variable, collection or an object.

34.True, Java methods are capable of taking any number of parameters.

35.True, the output will be 3abc6.

36.True, We can write a program to do the calls mentioned in the question.But the program will go into infinite loop.

37.True, we can create nested loops with as many for loops as we want inside one another. Most of the sorting algorithms use two for loops.

38.False, a and b both will be 6.

39.True, as the identifier is getting started with '_' it is valid.

40.False, byte code will not change for a program even if the platform is changed.