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Java Class
class student { int id; String name; public static void main(String[] args) { student s1=new student(); System.out.println(s1.id); System.out.println(s1.name); } }
Multiple Classes
class Student{ int id; String name; } class Teacher{ int id; String name; } class testStudent1{ public static void main(String args[]){ Student s1=new Student(); Teacher t1=new Teacher(); System.out.println(s1.id + " "+ s1.name); System.out.println(t1.id + " "+ t1.name); } }
Object Initialization
class Stu{ int id; String name; } class TestStudent3{ public static void main(String args[]){ //Creating objects Stu s1=new Stu(); Stu s2=new Stu(); //Initializing objects s1.id=101; s1.name="Sonoo"; s2.id=102; s2.name="Amit"; //Printing data System.out.println(s1.id+" "+s1.name); System.out.println(s2.id+" "+s2.name); } }
Constructors- Default Constructor
class Con1{ int i; Con1() { i=1; } public static void main(String args[]){ Con1 b=new Con1(); System.out.println("object is created ->" + b.i); } }
Parameterized Constructor
class Student4{ int id; String name; Student4(int i,String n){ id = i; name = n; } void display() { System.out.println(id+" "+name); } public static void main(String args[]){ Student4 s1 = new Student4(111,"Karan"); Student4 s2 = new Student4(222,"Aryan"); s1.display(); s2.display(); } }
Accessor and Mutator
class Stu5{ int rollno; String name; public int getRollno() { return rollno; } public void setRollno(int r) { rollno = r; } public String getName() { return name; } public void setName(String n) { name = n; } } class accessAndMutate{ public static void main(String args[]){ Stu5 s1=new Stu5(); Stu5 s2=new Stu5(); s1.setRollno(12); s1.setName("Aman"); s2.setRollno(13); s2.setName("Manoj"); System.out.println(s1.getRollno()+" "+s1.getName()); System.out.println(s2.getRollno()+" "+s2.getName()); }}
Single Inheritance
class Animal { void eat() { System.out.println("eating..."); } } class Dog extends Animal { void bark() { System.out.println("barking..."); } } class TestInheritance { public static void main(String args[]) { Dog d=new Dog(); d.bark(); d.eat(); } }
Hierarchical inheritance
class Animal { void eat(){System.out.println("eating...");} } class Dog2 extends Animal { void bark(){System.out.println("barking...");} } class Cat extends Animal { void meow(){System.out.println("meowing...");} } class Hierarchical { public static void main(String args[]){ Cat c=new Cat(); c.meow(); c.eat(); //c.bark(); }}
Static Variable
class Student8{ int rollno; String name; static String college ="AMU"; Student8(int r,String n){ rollno = r; name = n; } void display (){System.out.println(rollno+" "+name+" "+college);} } class staticVar { public static void main(String args[]){ Student8 s1 = new Student8(111,"Karan"); Student8 s2 = new Student8(222,"Aryan"); s1.display(); s2.display(); } }
Static Method
class vehicle{ String model; vehicle( String str) { model = str; } public void printModel() { System.out.println(model); } public static void mileToKM(double mile) { System.out.println(mile*1.6); } } class staticMethod { public static void main(String args[]){ vehicle v1 = new vehicle ("BMW"); v1.printModel(); vehicle v2 = new vehicle ("Honda"); v2.printModel(); vehicle.mileToKM(10); } }
