From 1a4c1f8adc82c54e6f7523ad81bab960a8378ab6 Mon Sep 17 00:00:00 2001
From: Ceiling_roof <ted10014@hotmail.com>
Date: Thu, 28 Jan 2021 13:54:52 +0800
Subject: [PATCH 1/3] Committed 2021/1/28

---
 Chapter6/SDemo2.java | 27 +++++++++++++++++++++++++++
 1 file changed, 27 insertions(+)
 create mode 100644 Chapter6/SDemo2.java

diff --git a/Chapter6/SDemo2.java b/Chapter6/SDemo2.java
new file mode 100644
index 0000000..9f8acbc
--- /dev/null
+++ b/Chapter6/SDemo2.java
@@ -0,0 +1,27 @@
+// Use a static method. 
+class StaticMeth{
+	static int val = 1024;  // a static variable
+	
+	// a static method
+	static int valDiv2() {
+		return val/2;
+	}
+	
+}
+
+
+public class SDemo2 {
+
+	public static void main(String[] args) {
+		// TODO Auto-generated method stub
+		
+		System.out.println("val is " + StaticMeth.val);
+		System.out.println("StaticMeth.valDiv2(): " + StaticMeth.valDiv2());
+		
+		StaticMeth.val = 4;
+		System.out.println("val is " + StaticMeth.val);
+		System.out.println("StaticMeth.valDiv2(): " + StaticMeth.valDiv2());
+
+	}
+
+}

From 71d3e15576846d94e1fa0c77e1cc47269ae3ad79 Mon Sep 17 00:00:00 2001
From: Ceiling_roof <ted10014@hotmail.com>
Date: Thu, 28 Jan 2021 14:08:22 +0800
Subject: [PATCH 2/3] Committed 2021/1/28

---
 Chapter6/StaticError.java | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)
 create mode 100644 Chapter6/StaticError.java

diff --git a/Chapter6/StaticError.java b/Chapter6/StaticError.java
new file mode 100644
index 0000000..eea16c3
--- /dev/null
+++ b/Chapter6/StaticError.java
@@ -0,0 +1,19 @@
+
+public class StaticError {
+	
+	int denom = 3;           // A normal instance variable
+	static int val = 1024;   // A static variable
+	
+	/* Error! Can't access a non-static variable from within a static method. */	
+	static int valDivDenom() {
+		return val/denom;  // won't compile!
+	}
+
+	public static void main(String[] args) {
+		// TODO Auto-generated method stub
+		
+		System.out.println("StaticError.valDivDenom = " + StaticError.valDivDenom());
+
+	}
+
+}

From cd4470009c175b6ebb2d16dd82550935e303cf32 Mon Sep 17 00:00:00 2001
From: Ceiling_roof <ted10014@hotmail.com>
Date: Thu, 28 Jan 2021 14:27:28 +0800
Subject: [PATCH 3/3] Committed 2021/1/28

---
 Chapter6/SDemo3.java | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)
 create mode 100644 Chapter6/SDemo3.java

diff --git a/Chapter6/SDemo3.java b/Chapter6/SDemo3.java
new file mode 100644
index 0000000..c4b4a35
--- /dev/null
+++ b/Chapter6/SDemo3.java
@@ -0,0 +1,31 @@
+// Use a static block
+class StaticBlock{
+	static double rootOf2;
+	static double rootOf3;
+	
+	// This block is executed when the class is loaded.
+	static {
+		System.out.println("Inside static block.");
+		rootOf2 = Math.sqrt(2.0);
+		rootOf3 = Math.sqrt(3.0);
+	}
+	
+	public StaticBlock(String msg) {
+
+		System.out.println(msg);
+
+	}
+}
+
+public class SDemo3 {
+
+	public static void main(String[] args) {
+		// TODO Auto-generated method stub
+		StaticBlock ob = new StaticBlock("Inside Constructor");
+		
+		System.out.println("Square root of 2 is " + StaticBlock.rootOf2);
+		System.out.println("Square root of 3 is " + StaticBlock.rootOf3);
+
+	}
+
+}