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Lesson 02: javac, jdk and Datatypes in java

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  Javac : Java compiler Java compiler converts high level source code that is daba program into byte code whenever a Java Program is compiled it produces a file having dot class extension. for each class present in our Java program the dot class file contains bytecode of respective class Java program can be compiled by using following syntax   javac java_file_name.java Java: This is a Java interpreter. The Java interpreter converts the bytecode into native machine level code ( that is into code that can be understand by operating system ) close and execute Java program. A Java Program can be executed by specifying name of the class which contains main () java_class_name having main() function Data Types in Java
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Practice 02: Operators in Java

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1.Write a program to implement arithmetic operators. public class j04ArithmeticOperators { public static void main ( String [] args ) { // declare variables int a = 12 , b = 5 ; // addition operator System . out . println ( "a + b = " + ( a + b )); // subtraction operator System . out . println ( "a - b = " + ( a - b )); // multiplication operator System . out . println ( "a * b = " + ( a * b )); // division operator System . out . println ( "a / b = " + ( a / b )); // modulo operator System . out . println ( "a % b = " + ( a % b )); } } 2.Write a program to add three numbers and find their sum and mean. import java.util.Scanner ; public class j05threenumsummean { public static void main ( String [] args ) { int a , b , c ; int sum ; double mean ; Scanner sc = new Scanner ( System . in ); Sy...
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Practice 01: Variables and Data Types

 1.Write a program to print following output:  Hello I am Learning Java. public class j01PrintingData { public static void main ( String [] args ) { System . out . println ( "Hello I am Learning Java" ); } } 2.Write a program to enter three values of type String, Int, Float and store it into variables of different types and print them. import java.util.Scanner ; public class j02Variabletypes { public static void main ( String [] args ) { Scanner sc = new Scanner ( System . in ); int number ; float decimalNumber ; String name ; System . out . println ( "Enter a Number: " ); number = sc . nextInt (); System . out . println ( "Enter a Floating number: " ); decimalNumber = sc . nextFloat (); System . out . println ( "Enter a String: " ); name = sc . next (); System . out . println ( number ); System . out . println ( decimalNumber ); ...
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