Unchecked异常，不强制try catch
1）Throwable,Exception,当在java程序中，手动抛出时，需要进行捕捉
2）Error，RunTimeException，当在java程序中，手动抛出时，是不需要进行捕捉的
（3）Throwable,Error是unChecked的异常，不强制捕获，但是如果要捕捉，还是可以捕获的
源码：
public class TestThrows {
static void throwRuntimeException(){
throw new RuntimeException("RuntimeException");
}
static void throwError(){
throw new Error("Error");
}
/*static void throwException(){
throw new Exception("Exception");
}
static void throwThrowable(){
throw new Throwable("Throwable");
}*/
public static void main(String[] args) {
System.out.println("before throwError");//before throwError
try {
throwError();
} catch (Error e) {
// TODO Auto-generated catch block
}
System.out.println("after throwError");//after throwError
System.out.println("before throwRuntimeException");//before throwRuntimeException
try {
throwRuntimeException();
} catch (RuntimeException e) {
// TODO Auto-generated catch block
}
System.out.println("after throwRuntimeException");//after throwRuntimeException
}
}