Guava Throwable類

Throwable類提供了相關的Throwable接口的實用方法。

類聲明

以下是com.google.common.base.Throwables類的聲明：

public final class Throwables
? ?extends Object

類方法

繼承的方法

這個類繼承了以下類方法：java.lang.Object

Throwables示例

創建使用所選擇的任何編輯器下面的java程序，比如 C:/> Guava
GuavaTester.java

import java.io.IOException;

import com.google.common.base.Objects;
import com.google.common.base.Throwables;

public class GuavaTester {
   public static void main(String args[]){
      GuavaTester tester = new GuavaTester();
      try {
         tester.showcaseThrowables();
      } catch (InvalidInputException e) {
         //get the root cause
         System.out.println(Throwables.getRootCause(e));
      }catch (Exception e) {
         //get the stack trace in string format
         System.out.println(Throwables.getStackTraceAsString(e));				
      }

      try {
         tester.showcaseThrowables1();			
      }catch (Exception e) {
         System.out.println(Throwables.getStackTraceAsString(e));				
      }
   }

   public void showcaseThrowables() throws InvalidInputException{
      try {
         sqrt(-3.0);			
      } catch (Throwable e) {
         //check the type of exception and throw it
         Throwables.propagateIfInstanceOf(e, InvalidInputException.class);		
         Throwables.propagate(e);
      }	
   }

   public void showcaseThrowables1(){
      try {			
         int[] data = {1,2,3}; 
         getValue(data, 4);			
      } catch (Throwable e) {        
         Throwables.propagateIfInstanceOf(e, IndexOutOfBoundsException.class);		
         Throwables.propagate(e);
      }	
   }

   public double sqrt(double input) throws InvalidInputException{
      if(input < 0) throw new InvalidInputException();
      return Math.sqrt(input);
   }

   public double getValue(int[] list, int index) throws IndexOutOfBoundsException {
      return list[index];
   }

   public void dummyIO() throws IOException {
      throw new IOException();
   }
}

class InvalidInputException extends Exception {
}

驗證結果

使用javac編譯器編譯如下類

C:\Guava>javac GuavaTester.java

現在運行GuavaTester看到的結果

C:\Guava>java GuavaTester

看到結果

InvalidInputException
java.lang.ArrayIndexOutOfBoundsException: 4
?? ?at GuavaTester.getValue(GuavaTester.java:52)
?? ?at GuavaTester.showcaseThrowables1(GuavaTester.java:38)
?? ?at GuavaTester.main(GuavaTester.java:19)

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