How to print all properties in StackFrame API in Java 9?

StackWalker API is a new feature in Java 9 that improves upon the predecessor stack performance track elements. It can also provide a way to filter stack elements in exception situations or to understand applicationbehavior. In Java 9, access to stack traces is very limited and the entire stack information is available at once.

In the following example, we need to print all the attributes in the stack frame p>

Example

import java.lang.StackWalker.StackFrame;
import java.util.*;
import java.util.stream.*;
import java.lang.StackWalker.Option;

public class AllAttributesTest {
   public static void main(String args[]) {
      System.out.println("Java 9 Stack Walker API - Print all attributes in stack frame");
      <strong>StackWalker </strong>newWalker = StackWalker.getInstance(<strong>Option</strong>.<strong>RETAIN_CLASS_REFERENCE</strong>);
      <strong>List<StackWalker.StackFrame></strong> stackFrames = newWalker.walk(frames ->  frames.limit(1).collect(<strong>Collectors.toList()</strong>));
      stackFrames.forEach(test-> {
         System.out.printf("[Bytecode Index] %d%n", test.<strong>getByteCodeIndex()</strong>);
         System.out.printf("[Class Name] %s%n", test.<strong>getClassName()</strong>);
         System.out.printf("[Declaring Class] %s%n", test.<strong>getDeclaringClass()</strong>);
         System.out.printf("[File Name] %s%n", test.<strong>getFileName()</strong>);
         System.out.printf("[Method Name] %s%n", test.<strong>getMethodName()</strong>);
         System.out.printf("[Is Native] %b%n", test.<strong>isNativeMethod()</strong>);
         System.out.printf("[Line Number] %d%n", test.<strong>getLineNumber()</strong>);
      });
   }
}

Output

<strong>Java 9 Stack Walker API - Print all attributes in stack frame
[Bytecode Index] 21
[Class Name] AllAttributesTest
[Declaring Class] class AllAttributesTest
[File Name] AllAttributesTest.java
[Method Name] main
[Is Native] false
[Line Number] 10</strong>

The above is the detailed content of How to print all properties in StackFrame API in Java 9?. For more information, please follow other related articles on the PHP Chinese website!