Merge remote-tracking branch 'origin/main'

# Conflicts:
#	Core JAVA.md

Author: akashdip2001

Core JAVA.md

@@ -914,6 +914,26 @@ Example:
 
 ---
 
+
+# 🎯 **boolean**
+
+**Feature** | **Value**
+---|---
+**Size** | 1 bit (although JVM implementations often use 1 byte for internal representation)
+**Value** | `true` or `false`
+
+🔸 **Common Compile-Time Errors with boolean**
+
+**Code** | **Result** | **Compiler Message (error)**
+---|---|---
+`boolean b = true;` | ✅ Valid | —
+`boolean b = 0;` | ❌ Invalid | Incompatible types, found: int, required: boolean
+`boolean b = True;` | ❌ Invalid | Cannot find symbol, symbol: variable True, location: class Test
+`boolean b = "true";` | ❌ Invalid | Incompatible types, found: java.lang.String, required: boolean
+
+---
+---
+
 <img src="img/JVM%2001.jpg">
 
 In C/C++, this two are allow because of.