What is the difference between checked and unchecked exceptions?

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Chetan Santha

Professional Tutor with 15 years of experience.

The main difference between checked and unchecked exception is that the checked exceptions are checked at compile-time while unchecked exceptions are checked at runtime
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Senior Software Engineer

Checked Exception in Java is all those Exception which requires being catches and handled during compile time. If Compiler doesn’t see try or catch block handling a Checked Exception, it throws Compilation error. Now Which Exception is checked Exception and Why Checked Exception are introduced in first...
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Checked Exception in Java is all those Exception which requires being catches and handled during compile time. If Compiler doesn’t see try or catch block handling a Checked Exception, it throws Compilation error. Now Which Exception is checked Exception and Why Checked Exception are introduced in first place? All the Exception which are direct sub Class of Exception but not inherit RuntimeException are Checked Exception. read less
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Software Engineer with 15 years of Professional experience in MNCs (JP Morgan, TCS, Mastek)

A checked exception must either be handled within a catch block or declared with a throws clause in the method declaration. If not, the compiler will throw an error. There are no such restrictions with unchecked exceptions.
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Software Engineer with 15 years of Professional experience in MNCs (JP Morgan, TCS, Mastek)

A checked exception usually occurs out of an exceptional situation that your application should reasonably try to recover from. For example, on catching a FileNotFoundException your program could prompt the user for the correct file path again. An unchecked exception usually occurs because of a bug...
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A checked exception usually occurs out of an exceptional situation that your application should reasonably try to recover from. For example, on catching a FileNotFoundException your program could prompt the user for the correct file path again. An unchecked exception usually occurs because of a bug in your application. Hence, instead of catching the exception, you fix the underlying logic of your program. For example, if you incorrectly access an array at an index that lies outside its size, an IndexOutOfBoundsException is thrown. read less
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Tutor

meant for conditonal based response for exception handling
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Software Development Trainer

Checked exceptions are checked at compile time. Like if you are trying to read a file, then there are chances of getting an exception. So compiler forces use to use either try...catch block or use throws(at function level). But unchecked exceptions are which ain't checked for at compile time. Like...
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Checked exceptions are checked at compile time. Like if you are trying to read a file, then there are chances of getting an exception. So compiler forces use to use either try...catch block or use throws(at function level). But unchecked exceptions are which ain't checked for at compile time. Like in case you are dividing a number via another. There are chances of getting divide by zero exception but compiler doesn't force you to use try...catch or throws. read less
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10 years of Hadoop Spark Expertise

checked exception has been thrown at the time of compilation, we can handle in two ways we can handle this by try catch block or we can throw this exception. Un checked exceptions are the exceptions thrown at the time of run time, we can handle this by using try and catch blocks.
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Trainer

Checked exceptions, as the name indicates, are checked at compile time. It extends the Throwable as well as Error exception classes. They are like syntactical errors and are detected by compiler at compile time. Examples of Checked exceptions: IOException and SQLException. Whereas Unchecked exceptions...
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Checked exceptions, as the name indicates, are checked at compile time. It extends the Throwable as well as Error exception classes. They are like syntactical errors and are detected by compiler at compile time. Examples of Checked exceptions: IOException and SQLException. Whereas Unchecked exceptions are checked at run-time and they extend Throwable and Runtime exception classes. Examples of Unchecked exceptions: ArithmeticException and NullPointerException. read less
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More than 12 years of experience in IT Industry including Science/Computer teaching

1) Checked Exception The classes that extend Throwable class except RuntimeException and Error are known as checked exceptions e.g.IOException, SQLException etc. Checked exceptions are checked at compile-time. 2) Unchecked Exception The classes that extend RuntimeException are known as unchecked...
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1) Checked Exception The classes that extend Throwable class except RuntimeException and Error are known as checked exceptions e.g.IOException, SQLException etc. Checked exceptions are checked at compile-time. 2) Unchecked Exception The classes that extend RuntimeException are known as unchecked exceptions e.g. ArithmeticException, NullPointerException, ArrayIndexOutOfBoundsException etc. Unchecked exceptions are not checked at compile-time rather they are checked at runtime. read less
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Principal Software Engr with good JAVA, J2EE, SQL skills

For Checked exceptions we need to catch or declare to be thrown using 'throws' at method signature. For Unchecked exceptions we no need to all these.
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