This content originally appeared on DEV Community and was authored by Neelakandan R
try block: Exception Possible Area
catch Block: Exception Handling Area
finally Block: Code Cleansing Area
1) try block inside another try - Nested try
try
{
int no1 = 10, no2 = 5;
System.out.println(no1/no2);
try
{
int[] ar = new int[no1];
}
catch(NegativeArraySizeException na)
{
}
}
catch(ArithmeticException ae) { }
2) try block inside catch block.
int no1 = 10, no2 = 0;
try
{
System.out.println(no1/no2);
}
catch(ArithmeticException ae)
{
Scanner sc = new Scanner(System.in);
no2 = sc.nextInt();
try {
System.out.println(no1/no2);
}
catch(ArithmeticException aa)
{
}
}
3) try catch block inside finally block
Yes, it is possible.
throws:
We can add throws after method signature. We can add any number of throws after method signature. If throws is given, try catch can / should be added at Method calling statement.
public class RecursionDemo
{
public static void main(String[] args)
{
RecursionDemo rd = new RecursionDemo();
rd.divide(100, 20);
}
public void divide(int no1, int no2)
throws ArithmeticException, ArrayIndexOutOfBoundsException,
NegativeArraySizeException
{
System.out.println(no1/no2);
int[] ar = new int[no2];
for(int i=0; i<10; i++)
System.out.println(ar[i]);
}
}
public class Patterns {
public static void main(String[] args) {
RecursionDemo rd = new RecursionDemo();
try
{
rd.divide(0, 0);
}
catch(ArithmeticException ae)
{
System.out.println("Check no2");
}
}
}
throw:
Predefined Exceptions.
User Defined Exceptions.
throw is mainly used for User Defined Exceptions. We can add throw inside method definition. After 'throw' keyword,we should mention Exception object.
package pratice;
public class Exeception_throw extends RuntimeException {
public void checkPassword(String pwd) {
if (pwd.length() < 8) {
Exeception_throw pe = new Exeception_throw();
throw pe; // throw may used for user define object//throw object
}
}
}
package pratice;
import java.util.Scanner;
public class public_login {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
System.out.println("Enter Password: ");
String password = sc.next();
Exeception_throw pp = new Exeception_throw();
pp.checkPassword(password);
}
}
Enter Password:
123456
Exception in thread "main" pratice.Exeception_throw
at Second/pratice.Exeception_throw.checkPassword(Exeception_throw.java:6)
at Second/pratice.public_login.main(public_login.java:12)
This content originally appeared on DEV Community and was authored by Neelakandan R
Neelakandan R | Sciencx (2025-03-18T11:49:43+00:00) Exception Handling,throw,throws. Retrieved from https://www.scien.cx/2025/03/18/exception-handlingthrowthrows/
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