Java Throwable getSuppressed()用法及代碼示例

Throwable類的getSuppressed()方法用於返回包含所有被抑製以傳遞此異常的異常的數組，通常該抑製是由try-with-resources語句完成的。為了傳遞異常如果沒有抑製任何異常或禁用了抑製，則將返回一個空的抑製異常數組。對返回數組的任何更改都不會影響以後對該方法的調用。

用法:

public final Throwable[] getSuppressed()

參數：此方法不接受任何內容作為參數。

返回值：此方法返回一個包含所有被抑製的異常的數組。

以下示例程序旨在說明Throwable類的getSuppressed()方法：

示例1:

// Java program to demonstrate 
// the getSuppressed() Method. 
  
import java.io.*; 
  
class GFG { 
  
    // Main Method 
    public static void main(String[] args) 
        throws Exception 
    { 
  
        try { 
  
            testException1(); 
        } 
  
        catch (Throwable e) { 
  
            // get StackTraceElements 
            // using getStackTrace() 
            Throwable[] suppExe 
                = e.getSuppressed(); 
  
            // print element of suppExe 
            for (int i = 0; i < suppExe.length; i++) { 
  
                System.out.println("Suppressed Exceptions:"); 
                System.out.println(suppExe[i]); 
            } 
        } 
    } 
  
    // method which throws Exception 
    public static void testException1() 
        throws Exception 
    { 
  
        // creating a suppressed Exception 
        Exception 
            suppressed 
            = new ArrayIndexOutOfBoundsException(); 
  
        // creating a IOException object 
        final IOException ioe = new IOException(); 
  
        // adding suppressed Exception 
        ioe.addSuppressed(suppressed); 
  
        // throwing IOException 
        throw ioe; 
    } 
}

輸出：

Suppressed Exceptions:
java.lang.ArrayIndexOutOfBoundsException

示例2:

// Java program to demonstrate 
// the getSuppressed() Method. 
  
import java.io.*; 
  
class GFG { 
  
    // Main Method 
    public static void main(String[] args) 
        throws Exception 
    { 
        try { 
  
            // add the numbers 
            addPositiveNumbers(2, -1); 
        } 
  
        catch (Throwable e) { 
  
            // get StackTraceElements 
            // using getStackTrace() 
            Throwable[] suppExe 
                = e.getSuppressed(); 
  
            // print element of stktrace 
            System.out.println("Suppressed Exception Array"
                               + " length = "
                               + suppExe.length); 
        } 
    } 
  
    // method which adds two positive number 
    public static void addPositiveNumbers(int a, int b) 
        throws Exception 
    { 
  
        // if Numbers are Positive 
        // than add or throw Exception 
        if (a < 0 || b < 0) { 
  
            throw new Exception("Numbers are not Positive"); 
        } 
  
        else { 
  
            System.out.println(a + b); 
        } 
    } 
}

輸出：

Suppressed Exception Array length = 0

參考文獻：
https://docs.oracle.com/javase/10/docs/api/java/lang/Throwable.html#getSuppressed()

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注：本文由純淨天空篩選整理自AmanSingh2210大神的英文原創作品 Throwable getSuppressed() method in Java with Examples。非經特殊聲明，原始代碼版權歸原作者所有，本譯文未經允許或授權，請勿轉載或複製。