Java 中 getCause() 方法的重要性?\n
getCause() 方法来自 Throwable 类,我们可以使用该方法,它返回异常的 cause 或在异常的 cause 不知道时返回 null。getCause() 方法不接受任何参数,也不抛出异常。它返回由其一个构造函数提供的或由 Throwable 类 initCause() 方法的形成确定的 cause。
语法
public Throwable getCause()
示例
public class GetCauseMethodTest { public static void main(String[] args) throws Exception { try { myException(); } catch(Exception e) { System.out.println("Cause = " + e.getCause()); } } public static void myException() throws Exception { int arr[] = {1, 3, 5}; try { System.out.println(arr[8]); } catch(ArrayIndexOutOfBoundsException aiobe) { Exception e = new Exception(); throw(Exception); // throwing the exception to be caught by catch block in main() e.initCause(aiobe); // supplies the cause to getCause() } } }
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输出
Cause = java.lang.ArrayIndexOutOfBoundsException: 8
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