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StackWalking.java
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StackWalking.java
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package dev.nipafx.demo.java9.api.stack_walking;
import java.lang.StackWalker.StackFrame;
import java.util.Arrays;
import java.util.stream.Stream;
class StackWalking {
public static void main(String[] args) {
oldWay();
newWay();
}
static void oldWay() {
StackTraceElement[] stackTrace = new Throwable().getStackTrace();
String line = oldWalk(stackTrace);
System.out.println(line);
}
private static String oldWalk(StackTraceElement[] stackTrace) {
return Arrays.stream(stackTrace)
.peek(frame -> System.out.println(frame.getMethodName()))
.filter(frame -> frame.getMethodName().contains("oldWay"))
.findFirst()
.map(frame -> "Line " + frame.getLineNumber())
.orElse("Unknown line");
}
static void newWay() {
one();
}
static void one() {
two();
}
static void two() {
three();
}
static void three() {
String line = StackWalker.getInstance().walk(StackWalking::newWalk);
System.out.println(line);
}
private static String newWalk(Stream<StackFrame> stackFrameStream) {
return stackFrameStream
.filter(frame -> frame.getMethodName().contains("one"))
.findFirst()
.map(frame -> "Line " + frame.getLineNumber())
.orElse("Unknown line");
}
}