JAVA - Override
public class main extends A{
public static void main(String[] args) {
main obj = new main();}
public main(){printinfo();
}
@Override
public void printinfo() {
super.printinfo();
System.out.println("HI");
}
}
public class A {
int w=10;public void printinfo()
{ System.out.println("super class "+w);}
}
JAVA–Exception
import java.util.Scanner;
public class a {
public static void main(String[] args) {
int x=1;Scanner a = new Scanner(System.in);
do{ try{System.out.println("enter two number : ");
int n= a.nextInt(); int m= a.nextInt(); int sum = n/m; System.out.println(sum);}
catch(Exception e) {System.out.println("you can do that fix that");
}
}while(x==1);}}
File–Writing
main
public class writing2 {
public static void main(String[] args) {
writing obj=new writing();obj.openFile();
obj.add();
obj.close();
}
}
import java.io.File;
import java.util.Formatter;
public class writing {
private Formatter x;public void openFile()
{ try {x =new Formatter("shadhi.txt");
}
catch(Exception e){System.out.println("you have an error");
}
}
public void add()
{x.format("%s%s%s","20"," new ","number");
}
public void close()
{x.close();
}
}
File–Reading
public class reading2 {
public static void main(String[] args) {
Reading obj = new Reading();obj.openfile();
obj.readfile();
obj.closefile();
}
}
import java.io.File;
import java.util.Scanner;
public class Reading {
private Scanner x;public void openfile()
{ try {x= new Scanner(new File("Catch.txt"));
}
catch(Exception e) {System.out.println("you got an error");
}
}
public void readfile()
{ while (x.hasNext()) {String a = x.next();
String b = x.next();
String c = x.next();
System.out.println(a + b + c);}
}
public void closefile()
{x.close();
}
}
JAVA–FILE exists or Not !
//main method
import java.io.File;
public class A {
public static void main(String[] args) {
File xFile = new File("D:\\ONLINE\\Dropbox\\CSE - WORLD\\Java File\\tx.txt");
if(xFile.exists())
{
System.out.println(xFile.getName()+" exist");
}
else {
System.out.println("no");
}
}
}
//AnotherClass
import java.util.Formatter;
public class B {
public static void main(String[] args) {
final Formatter x;
try {
x = new Formatter("shadh.txt");
System.out.println("you create a file");
}
catch (Exception e)
{
System.out.println("you got an error");
}
}
}