java.lang.Throwable.getCause()方法实例

java.lang.Throwable.getCause()方法实例

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 java.lang.Throwable.getCause() 方法返回此抛出或空的原因，如果原因不存在或未知

声明

以下是java.lang.Throwable.getCause()方法的声明

public Throwable getCause()

参数

• NA

返回值

此方法返回此抛出或空的原因，如果原因不存在或未知。

异常

• NA

例子

下面的例子显示java.lang.Throwable.getCause()方法的使用。

package com.yiibai;

import java.lang.*;

public class ThrowableDemo {

   public static void main(String[] args) throws Throwable {

     try {
        newException();
     }
     catch(Throwable e) {
        System.err.println(e);
        // returns null as the cause is nonexistent or unknown.
        System.err.println("Cause = " + e.getCause());
     }
   }
  
   public static void newException() throws Exception {
      System.out.println("This is newException() function");
      throw new Exception("Exception...");
   }
}
 

让我们来编译和运行上面的程序，这将产生以下结果：

This is newException() function
java.lang.Exception: Exception...
Cause = null