Java的异常处理：try-catch-finally throws throw

Java的异常分为

public void method() {
//此处会弹出编译时异常：FileNotFoundException
FileInputStream stream = new FileInputStream("Hello.txt");

int b;
//此处会弹出编译时异常：IOException
if ((b = stream.read()) != -1) {
System.out.println((char)b);
}
//此处会弹出编译时异常：IOException
stream.close();
}

public static void method1() {
int[] arr = new int[10];
//此处异常编写时并不会弹出错误，运行时弹出异常：ArrayIndexOutOfBoundsException
System.out.println(arr[10]);
}

public void method2() {
//method2方法收到异常后，进行了具体的处理
try {
method();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
} finally {
System.out.println("异常处理完成！");
}
}

//method方法使用throws把异常交给调用该方法的对象处理
public void method() throws FileNotFoundException, IOException{
FileInputStream stream = new FileInputStream("Hello.txt");

int b;
if ((b = stream.read()) != -1) {
System.out.println((char)b);
}
stream.close();
}

public void method4() {
Scanner scanner = new Scanner(System.in);
System.out.println("请输入学生成绩：");
double score = scanner.nextDouble();

if (score >= 0 && score <= 100) {
System.out.println(score);
} else {
//throw手动抛出一个RuntimeException，此处建议使用运行时异常类
throw new RuntimeException("您输入的成绩有误");
}
}