Throwable類initCause()方法 (Throwable Class initCause() method)

• initCause() Method is available in java.lang package.

  initCause()方法在java.lang包中可用。

• initCause() Method is used to instantiate the cause of this throwable to the given value and this method is invoked within the constructor immediately after that we throw a throwable object.

  initCause()方法用于將此throwable的原因實例化為給定值，并且在我們拋出throwable對象之后立即在構造函數中調用此方法。

• initCause() Method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.

  initCause()方法是一種非靜態方法，只能通過類對象訪問，如果嘗試使用類名稱訪問該方法，則會收到錯誤消息。

• initCause() Method may throw an exception at the time of initializing cause.

  initCause()方法可能會在初始化原因時引發異常。

  • IllegalArgumentException – This exception may throw when the given argument is this object.IllegalArgumentException-如果給定參數是此對象，則可能引發此異常。
  • IllegalStateException – This exception may throw when the given argument was created with throwable or when this method called already on this throwable.IllegalStateException-當使用throwable創建給定參數時，或者在此throwable上已調用此方法時，可能會拋出此異常。

Syntax:

句法：

public Throwable initCause(Throwable caus);

Parameter(s):

參數：

• Throwable caus – represents the cause it retrieve by using getCause() method and if it returns null then cause is non-existent or not known.

  可拋出的原因-表示使用getCause()方法檢索的原因，如果返回null，則原因不存在或未知。

Return value:

返回值：

The return type of the method is Throwable, it returns reference to this "Throwable" object.

方法的返回類型為Throwable ，它返回對此“ Throwable”對象的引用。

Example:

例：

// Java program to demonstrate the example // of Throwable initCause(Throwable caus) // method of Throwable public class InitCause {public static void main(String args[]) throws Exception {try {// calling div() methoddiv(100, 0);} catch (ArithmeticException ex) {// Display the exception cause why it is//thrownSystem.out.println("Exception Cause:" + ex.getCause());}}// This method divide two numbers and will// throw an exceptionpublic static void div(int d1, int d2) throws Exception {try {int res = d1 / d2;} catch (ArithmeticException ex) {// creating an exceptionArithmeticException ae = new ArithmeticException();// instantiate exception cause by using//initCause() methodae.initCause(ex);// throw an exception with its causethrow (ae);}}}

Output

輸出量

Exception Cause:java.lang.ArithmeticException: / by zero

翻譯自: https://www.includehelp.com/java/throwable-initcause-method-with-example.aspx

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