to{}catch{}

 try{}catch{}的流传输

try {fis = new FileInputStream("file-APP\\fos.txt");fos = new FileOutputStream("fos.txt");int a ;while ((a= fis.read())!= -1){fos.write(a);}System.out.println(a);
} catch (IOException e) {e.printStackTrace();
} finally {try {if (fis != null) {fis.close();}} catch (IOException e) {e.printStackTrace();}
}

 try（）{}catch{}的流传输 省略close（）

try{}catch{}finally{}

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finalize（）方法*

Objects的equals()方法*

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抛异常

 自己怎么创建异常 抛异常

 创建异常类  重载所有构造方法

class StudentAgeIllegalException extends Exception {public StudentAgeIllegalException() {}public StudentAgeIllegalException(String message) {super(message);}public StudentAgeIllegalException(String message, Throwable cause) {super(message, cause);}public StudentAgeIllegalException(Throwable cause) {super(cause);}public StudentAgeIllegalException(String message, Throwable cause, boolean enableSuppression, boolean writableStackTrace) {super(message, cause, enableSuppression, writableStackTrace);}
}

创建异常类对象

 抛出异常