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");
}
}
}
public class DoWhile {
public static void main(String[] args) {
int coun=0; do{coun++;
System.out.println(coun);
}while(coun<=10);}
}
public class NumberLength {
public static void main(String[] args) {
System.out.println(average(1,2,3,4,5,6));
}
public static int average(int... numbers)
{ int total=0,a = 0;for (int i=0;i<numbers.length;i++)
{a=numbers[i]+a;
}
return a;}
}
public class EnhanceLoop {
public static void main(String[] args) {
int a[]={5,2,3,5}; int total =0;for(int x:a)
{total+=x;
}
System.out.println(total);
}
}
public class ArrayMethod {
public static void main(String[] args) {
int a[]={3,5,4,6};change(a);
}
public static void change(int x[])
{for(int i=0;i<x.length;i++)
{System.out.println(x[i]);
}
}
}
public class Array2Dinput {
public static void main(String[] args) {
int two[][]={{8,3,4,5},{2,4,5,3,6},{4,1,2,5,7,8}}; int one[][]={{4,2,4,5,3},{1,2,4,5,6},{5}}; System.out.println("One");display(one);
System.out.println("TWO");display(two);
}
public static void display(int x[][])
{for(int i=0;i<x.length;i++)
{for(int j=0;j<x[i].length;j++)
{ System.out.print(x[i][j]+" ");}
System.out.println("\t");}
}
}
Java Array 2D
import java.util.Scanner;import java.util.Scanner;public class Array2D {
public static void main(String[] args) {
Scanner v = new Scanner(System.in);int a,b;System.out.println("Enter row :");a= v.nextInt();
System.out.println("Enter coloum :");b= v.nextInt();
int c[][]=new int[a][b];
for(int i=0;i<c.length;i++)
{for(int j=0;j<c[i].length;j++)
{c[i][j]=v.nextInt();
}
}
//............................ System.out.println("output");for(int i=0;i<c.length;i++)
{for(int j=0;j<c[i].length;j++)
{ System.out.print(c[i][j]+" ");}
System.out.println("\n"); }
}
}