greatsplife

package com.sudhirtheindian2.java123 ; public class instance_vs_static { public static void main (String[] args) { // What is difference between instance block & static block in java // Instance Block // Note -- instance block called before the constructor // 1 it deals with object // 2 executed at the time of object creation // 3 no any keyword required // 4 static & non static variable can be accessed // inside the instance block // Static Block // 1 It deals with class // 2 Executed at the time of loaded .class file in java // 3 static keyword is required // 4 only static variable can be accessed // inside the static block } }

package com.sudhirtheindian2.java123 ; public class PConstructor { int a ; String name ; private PConstructor (){ a = 45 ; name = "indian" ; System. out .println( a + " " + name ) ; } public static void main (String[] args) { PConstructor p = new PConstructor() ; // What is private Constructor in java ? // In java, it is possible to write a constructor as a private // but according to the rule we can not acceess // private members outside of the class } } //class B{ //// PConstructor p = new PConstructor(); //}

package com.sudhirtheindian2.java123 ; public class javaConstructor { int a ; String name ; boolean f ; javaConstructor (){ a = 10 ; name = "india" ; f = true; } void display (){ System. out .println( a + " " + name + " " + f ) ; } public static void main (String[] args) { javaConstructor jc = new javaConstructor() ; jc.display() ; // Types of constructor in java ---- // and what is default constructor // 1 private constructor // 2 default constructor // 3 parametrized constructor // 4 copy constructor // what is default constructor // // a constructor which does not have any parameter // is called default constructor // syntax---- // class A{ // // A(){ // // } // } }...

package com.sudhirtheindian2.java123 ; public class string_immutable { public static void main (String[] args) { // 1 Why string is immutable in java ? // (immutable means we can not change string) // 2 How to change string in java ? // 3 what is the benefit of immutable string // 1 same object name same address so memory use minimum // 2 program execution fast // String str1 = "India" ; //1000 String str2 = "India1" ; //1000 String str3 = "India3" ; //1000 // String str = "India"; // str.concat("is great"); // System.out.println(str); } }

package com.sudhirtheindian2.java123 ; public class string_java { public static void main (String[] args) { // How to use String in java // 1 String is a predefined class in java // but we can also use as a datatype // 2 String are the sequence of character and // its index starts from 0 // syntax // // 1 String str1 = new String("India"); // // 2 String str2 = "India" // String str1 = new String("India"); String str2 = "India" ; System. out .println(str2.toLowerCase()) ; // if(str1.equals(str2)){ // System.out.println("yes both are equal"); // } // else { // System.out.println("no both are not equal"); // // } // difference // 1 equals // 2 length of string // 3 toupprecase // 4 tolowercase } }

package com.sudhirtheindian2.java123 ; import java.util.Scanner ; public class twoDarray { public static void main (String[] args) { // How to use 2D array in java int [][] a = new int [ 2 ][ 2 ] ; System. out .println( "enter your array element" ) ; Scanner scanner = new Scanner(System. in ) ; for ( int i = 0 ; i< 2 ; i++){ for ( int j= 0 ; j< 2 ; j++){ a[i][j] = scanner.nextInt() ; } } for ( int i = 0 ; i< 2 ; i++){ for ( int j= 0 ; j< 2 ; j++){ System. out .print(a[i][j]+ " " ) ; } System. out .println() ; } } }

package com.sudhirtheindian2.java123 ; import java.util.Arrays ; import java.util.Scanner ; public class sortedarray { public static void main (String[] args) { // How to sorted array in java int [] a = new int [ 5 ] ; System. out .println( "enter your array element" ) ; Scanner scanner = new Scanner(System. in ) ; for ( int i = 0 ; i< 5 ; i++){ a[i] = scanner.nextInt() ; } Arrays. sort (a) ; for ( int c:a){ System. out .print(c+ " " ) ; } } }

package com.sudhirtheindian2.java123 ; import java.util.Scanner ; public class array_class { public static void main (String[] args) { // // How to use and print element of an array in java // What is array ? // Array is an object in java which contains similar type of data // in contiguous memory location // 1 array index starts with 0 // types of array // 1D array // 2Darray // for programmer // int[] a= {4,5,6,9,3}; // // for (int c:a){ // System.out.print(c+" "); // } // and // for user int [] a = new int [ 5 ] ; System. out .println( "enter your array element" ) ; Scanner scanner = new Scanner(System. in ) ; for ( int i = 0 ; i< 5 ; i++){ a[i]= scanner.nextInt() ; } System. out .println( "your printed array is : " ) ; for ( int d:a){ System. out .pr...

package com.sudhirtheindian2.java123 ; public class ternary_operator { public static void main (String[] args) { // How to use ternary operator in java // syntax // (?:) (a>b>c) // find the greatest number among a,b and c int a= 2 , b= 3 , c= 400 ; int result= (a>b)?(a>c?a:c):(b>c?b:c) ; System. out .println(result) ; } }

package com.sudhirtheindian2.java123 ; public class assignment_operator { public static void main (String[] args) { // How to use assignment operator in java // simple assignment operator // 1 = // compound assignment operator // 2+= // 3-= // multiple value increment decrement int a= 10 ; // a+=5;// a=a+5=10+5=15 // System.out.println(a); // a-=2;// a=a-2=10-2=8 // a=a-2; System. out .println(a) ; } }

package com.sudhirtheindian2.java123 ; public class increment_decrement_operator { public static void main (String[] args) { // How to use increment decrement operator in java // increment or decrement one value only // increment operator // 1 pre increment ++a // 2 post increment a++ // decrement operator // 1 pre decrement --a // 2 post decrement a-- int a= 10 ; // System.out.println(++a); // System.out.println(a++); // System.out.println(a++); // System.out.println(--a); System. out .println(a--) ; System. out .println(a--) ; } }

package com.sudhirtheindian2.java123 ; public class logical_operator { public static void main (String[] args) { // How to use logical operator in java // 1 && logical and operator // 2 || logical or operator // 3 != logical not operator int a= 5 , b = 10 ; // System.out.println(a==b && a>b); //5==10 5>10 // System.out.println(a==b || b>a); // 5==10 10>5 System. out .println(!(a==b) || a>b) ; } }

package com.sudhirtheindian2.java123 ; public class relational_operator { public static void main (String[] args) { // How to use relational operator in java // 1 == // 2!= // 3> // 4< // 5<= // 6>= int a = 5 , b= 10 ; System. out .println(a==b) ; //5==10 System. out .println(a!=b) ; //5!=10 System. out .println(a>b) ; //5>10 System. out .println(a<b) ; //5<10 System. out .println(a<=b) ; //5<=10 System. out .println(a>=b) ; //5>=10 } }

package com.sudhirtheindian2.java123 ; import java.util.Scanner ; public class calculater { public static void main (String[] args) { // How to make a calculater in java language int a , b , c , choice ; System. out .println( "enter two number" ) ; Scanner scanner = new Scanner(System. in ) ; System. out .println( "enter your first number" ) ; a=scanner.nextInt() ; System. out .println( "enter your second number" ) ; b=scanner.nextInt() ; System. out .println( "enter your choice" ) ; choice= scanner.nextInt() ; switch (choice){ case 1 : c=a+b ; System. out .println( "addition " +c) ; break; case 2 : c=a-b ; System. out .println( "subtraction " +c) ; break; case 3 : c=a*b ; System. out ...

package com.sudhirtheindian2.java123 ; import java.util.Scanner ; public class arithmetic_operator { public static void main (String[] args) { // What is operator and arithmetic operator with calculater example // operator // operator is a symbol that is used to perform // operatons according to user requirement // types of operator // arithmetic_operator // relational oprator // logical operator // arithmetic operator example int a , b , c , choice ; System. out .println( "enter the two number" ) ; Scanner scanner = new Scanner(System. in ) ; a= scanner.nextInt() ; b= scanner.nextInt() ; System. out .println( "enter your choice" ) ; choice= scanner.nextInt() ; switch (choice){ case 1 : c=a+b ; System. out .println( "addition " +c) ; break; case 2 : ...

package com.sudhirtheindian2.java123 ; public class Switch { public static void main (String[] args) { // How to use switch case statement in java // switch is a multiple choice decision making selection // statement , it used when we want to select // only one case out of multiple cases // syntax // switch (expression){ // case 1: // statement 1 // break; // case 2: // statement 2 // case 3: // statement 3 // case m : // statement m; // // // default: // default ; switch ( 35 ){ case 1 : System. out .println( "this is right value" ) ; break; case 2 : System. out .println( "this is very good" ) ; break; case 3 : System. out .println( "this is india" )...

package com.sudhirtheindian2.java123 ; public class foreach { public static void main (String[] args) { // How to use forEach loop in java // syntax -- // for(datatype var1:arrayvarname){ // // statement // } int []a = { 4 , 5 , 3 , 6 } ; for ( int a1 : a){ System. out .println(a1) ; } } }

package com.sudhirtheindian2.java123 ; import java.util.Scanner ; public class whileloop { public static void main (String[] args) { // How to use while loop in java // syntax--- // while(condition){ // //code // } System. out .println( "enter the number" ) ; Scanner scanner = new Scanner(System. in ) ; int num = scanner.nextInt() ; while (num>= 0 ){ if (num% 2 == 0 ){ System. out .println( "even number" ) ; break; } else { System. out .println( "odd number" ) ; break; } } } }

package com.sudhirtheindian2.java123 ; import java.util.Scanner ; public class whileloop { public static void main (String[] args) { // How to use while loop in java // syntax--- // while(condition){ // //code // } System. out .println( "enter the number" ) ; Scanner scanner = new Scanner(System. in ) ; int num = scanner.nextInt() ; while (num>= 0 ){ if (num% 2 == 0 ){ System. out .println( "even number" ) ; break; } else { System. out .println( "odd number" ) ; break; } } } }

  package com.sudhirtheindian2.java123 ; import java.util.Scanner ; public class looping_statement_for_loop { public static void main (String[] args) { // Types of looping statements in java // and write a program using for loop // 1 for // 2 while //// 3 do while //// 4 for each //// // whenever we want to repeat certain statement several times // then we should write those statements inside loop body // use of for loop // syntax // for(initialization; condition; inrement/decrement){ //// code // } // print a table without for loop and with for loop System. out .println( "enter the table number" ) ; Scanner scanner = new Scanner(System. in ) ; int num = scanner.nextInt() ; // for (int i =1; i<=10; i++){ // System.out.println(i*num); // } System. out .println(num* 1 ) ; System. out .println(num* 2 ) ; ...