java 代码解读复制代码publicclassErrorExample{publicstaticvoidmain(String[]args){try{// 这是一个示例,通常不建议捕获 ErrorthrownewOutOfMemoryError("Out of memory");}catch(Error e){System.out.println("Caught an error: "+e.getMessage());e.printStackTrace();}}} 总结 Exception通常表示可以捕获和...
All methods use the throw statement to throw an exception. The throw statement requires a single argument: a throwable object. Throwable objects are instances of any subclass of the Throwable class. Here's an example of a throw statement. throw someThrowableObject; Let's look at the throw ...
此外,尽量使用 unchecked exception 来处理编程错误:unchecked exception 的优点在于不强制客户端显示的处理它,它会传播(propagate)到任何你想捕获它的地方,或者它会在出现的地方挂起程序并报告异常信息。Java API中提供了丰富的 unchecked excetpion,如:NullPointerException , IllegalArgumentException 和 IllegalStateExcept...
反例(冗余校验): if (username == null || username.trim().isEmpty()) { throw new IllegalArgumentException("用户名不能为空"); } if (!Pattern.matches(EMAIL_REGEX, email)) { throw new IllegalArgumentException("邮箱格式错误"); } // 重复代码多 正解(标准化校验): public void register(Strin...
public final synchronized void join(long millis)throws InterruptedException {//开始时间long base = System.currentTimeMillis();//经历时间long now = 0;if (millis < 0) {//如果指定等待时间等于0则抛出异常throw new IllegalArgumentException("timeout value is negative");}if (millis == 0) {while ...
public void readPreferences(String filename) throws IllegalArgumentException, FileNotFoundException, IOException{ if (filename == null){ throw new IllegalArgumentException("filename is null"); } //if //... InputStream in = new FileInputStream(filename); //... } 技 术上来说,我们唯一...
engineWrap(Key key) throws IllegalBlockSizeException, InvalidKeyException { try { byte[] encoded = key.getEncoded(); return engineDoFinal(encoded, 0, encoded.length); } catch (BadPaddingException e) { IllegalBlockSizeException newE = new IllegalBlockSizeException(); newE.initCause(e); throw ...
抛出异常(Throwing Exceptions):当程序遇到异常情况时,可以通过throw关键字抛出一个异常对象。 捕获异常(Catching Exceptions):使用try-catch块来捕获并处理异常,防止程序崩溃。 异常类型 Java中的异常主要分为两大类: Checked Exception:编译时检查的异常,必须显式处理,如IOException。
ball.shoot(); // will throw NullPointerException But there are also more subtle ones like unboxing a wrapper type: Boolean willVote = null; if (willVote) { // will throw NullPointerException Or like when code assumes non-nullness in the parameters or return values it receives: ...
default -> throw new IllegalArgumentException("Invalid day of week: " + day); }; System.out.println(dayOfWeek); // Prints "Tuesday" 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 无论是代码量还是可读性上都有了改进。 对于过去很排斥switch,宁愿用if-elseif的的同学,可能是个新的选择...