In some programming languages , when a problem occurs during a execution , there is no way for you as a programmer to catch it and deals with the problem . In Java , most problems cause what are known as a exception .
Java try that a block is used to enclose the code that might throw an exception . No code can be between the end of the try block and the beginning of the catch block .
When a method states that it will throw an exception , there should be a catch block to catch the particular exception . If there is an error while reading , an exception called as IOException is thrown . When that happens , the code in the catch block is known as . There can be more than one catch block for a single try block .
Let us see an example given below:-
/*Write a program in Java to find the sum of three numbers entered by the user.*/
import java.io.*;
class sum
{
public static void main(String[] args)
{ InputStreamReader in= new InputStreamReader (System.in);
BufferedReader br= new BufferedReader(in);
try
{
System.out.println("Enter the First number");
int m = Integer.parseInt(br.readline());
System.out.println("Enter the second number");
int n = Integer.parseInt(br.readline());
System.out.println("Enter the third number");
int o = Integer.parseInt(br.readline());
int sum = m+n+o;
System.out.println("The sum of the three entered numbers are : "+ sum);
}
catch (Expression IO)
{
System.out.println ("Unexpected");
}
}
}
Output:-
Enter the first number
23
Enter the second number
56
Enter the third number
89
The sum of the three entered numbers are: 168
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