java throw two exceptions
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in java, exceptions are events that disrupt the normal flow of a program's execution. they can be either checked or unchecked exceptions. a checked exception is checked at compile-time, while an unchecked exception is checked at runtime. the `throw` keyword in java is used to explicitly throw an exception.
here's a tutorial on how to throw two different exceptions in java with code examples.
tutorial: throwing exceptions in java
#### 1. understanding exceptions
before throwing exceptions, it's essential to understand the types of exceptions:
**checked exceptions**: these are exceptions that the compiler forces you to handle, such as `ioexception` or `sqlexception`.
**unchecked exceptions**: these are exceptions that the compiler does not require you to handle, such as `nullpointerexception` or `arithmeticexception`.
#### 2. using the `throw` keyword
the `throw` keyword is used to explicitly throw an exception. you can throw both checked and unchecked exceptions.
#### 3. example code
let's create a java program that demonstrates throwing two different exceptions: a checked exception (`ioexception`) and an unchecked exception (`illegalargumentexception`).
explanation of the code
1. **readfile method**:
this method attempts to read from a file. if the file does not exist, it catches the `ioexception` and throws it again with a custom message.
the `throws ioexception` in the method signature indicates that this method may throw an `ioexception`, which is a checked exception.
2. **checkpositive method**:
this method checks if a given number is positive. if the number is negative, it throws an `illegalargumentexception`.
the `illegalargumentexception` is an unchecked exception, meaning it does not need to be declared in the method signature.
3. **main method**:
in the `main` method, we call `readfile` and handle the `ioexception` in a try-catch block.
we also call `checkpositive` and handle the `illegalargumentexcep ...
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