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checked exception

Checked exceptions–occurs at the compile time–compile time exceptions

File file = new File(“E://file.txt”); FileReader fr = new FileReader(file); 必须捕获或抛出FileNotFoundException否则编译不能通过

Unchecked exception

Unchecked exceptions–occurs at the time of execution–Runtime Exceptions

int num[] = {1, 2, 3, 4}; System.out.println(num[5]); 运行时报java.lang.ArrayIndexOutOfBoundsException

Errors

Errors–beyond the control of the user or the programmer–also ignored at the time of compilation

Errors are generated to indicate errors generated by the runtime environment. Example: JVM is out of memory. Normally, programs cannot recover from errors.

另一种分类

JVM Exceptions −

These are exceptions/errors that are exclusively or logically thrown by the JVM. Examples: NullPointerException, ArrayIndexOutOfBoundsException, ClassCastException.

Programmatic Exceptions − These exceptions are thrown explicitly by the application or the API programmers. Examples: IllegalArgumentException, IllegalStateException.

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