Add fresher-qa module: 50 Java interview questions for freshers, one runnable demo each, asserted transcripts, javac error captures

Co-Authored-By: Claude Sonnet 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_017ic4b5DfjBGLBr7F5km2AN

fresher-qa/scripts/compile-errors.sh

@@ -0,0 +1,20 @@
+#!/usr/bin/env bash
+# Compiles each file in src/broken/ (they are NOT part of the Maven build) and captures javac's own message.
+set -uo pipefail
+cd "$(dirname "$0")/../src/broken"
+out=../../output/07-compile-errors.txt
+: > "$out"
+for f in FinalOverride CheckedNotHandled LossyCast MissingReturnAndUnreachable; do
+  echo "=== javac $f.java ===" >> "$out"
+  javac --release 25 -d /tmp/fresher-broken "$f.java" 2>&1 | grep -v '^Picked up JAVA_TOOL_OPTIONS' >> "$out"
+  echo >> "$out"
+done
+# The same file under both language levels: an error before Java 25, fine from Java 25 (JEP 513).
+for rel in 21 25; do
+  echo "=== javac --release $rel PreSuper.java ===" >> "$out"
+  if javac --release "$rel" -d /tmp/fresher-broken "PreSuper.java" 2>&1 | grep -v '^Picked up JAVA_TOOL_OPTIONS' >> "$out"; [ "${PIPESTATUS[0]}" -eq 0 ]; then
+    echo "compiled without errors" >> "$out"
+  fi
+  echo >> "$out"
+done
+cat "$out"

fresher-qa/scripts/run-all.sh

@@ -0,0 +1,8 @@
+#!/usr/bin/env bash
+# Regenerates every file in output/. Needs JDK 25 and Maven (first Maven run online).
+# 01-06 are written by JUnit tests that assert the lines they write; 07 is javac's own output for src/broken/.
+set -euo pipefail
+cd "$(dirname "$0")/.."
+mvn -B -q -T1 test
+./scripts/compile-errors.sh > /dev/null
+echo "done:"; ls -1 output