State the data type and value of res after the following is executed:

char ch = '9';
res= Character.isDigit(ch);

Primitive data types are built in data types which are a part of the wrapper classes. These wrapper classes are encapsulated in the java.lang package. Non primitive datatypes like Scanner class are a part of the utility package for which an object needs to be created.

(a) To which package the Character and Boolean classes belong?

(b) Write the statement to access the Scanner class in the program.

Give the output of the following code:

String P = "20", Q ="19";
int a = Integer.parseInt(P);
int b = Integer.valueOf(Q);
System.out.println(a+""+b);