Day 3 break 1

Questions.txt

@@ -574,3 +574,34 @@ B) Exception at runtime
 C) Hello!, P-si: x is 0, C-si: y is 300, P-i: y is 101, P-c: y is 401, C-i x: is 200 Goodbye!
 D) , P-si: x is 0, C-si: y is 300Hello!, P-i: y is 101, P-c: y is 401, C-i x: is 200 Goodbye!
 E) Hello!, P-si: x is 99, C-si: y is 300, P-i: y is 101, P-c: y is 100Goodbye!
+
+Q) Given:
+class Parent {
+  Parent(int x) { y += x; out.print(", P-c: y is " + y); }
+  static { out.print(", P-si: x is " + Parent.x); }
+  static int x = 99;
+  int y = 100;
+  { y++; out.print(", P-i: y is " + y); }
+}
+class Child extends Parent {
+  int x = 200;
+  static int y = 300;
+  Child() { super(y); }
+  Child(int x) { this(); }
+  { out.print(", C-i x: is " + x); }
+  static { out.print(", C-si: y is " + y); }
+}
+class InitOrder3 {
+  public static void main(String[] args) {
+    out.print("Hello!");
+    new Child(-1);
+    out.println(" Goodbye!");
+  }
+}
+
+What is the result?
+A) Compilation fails
+B) Exception at runtime
+C) Hello!, C-si: y is 300, P-i: y is 101, P-c: y is 401, C-i x: is 200 Goodbye!
+D) , P-si: x is 0, C-si: y is 300Hello!, P-i: y is 101, P-c: y is 401, C-i x: is 200 Goodbye!
+E) Hello!, P-si: x is 99, C-si: y is 300, P-i: y is 101, P-c: y is 100Goodbye!

src/main/java/init2/Q.java

@@ -0,0 +1,28 @@
+package init2;
+
+import static java.lang.System.out;
+
+class Parent {
+  Parent(int x) { y += x; out.print(", P-c: y is " + y); }
+  static { out.print(", P-si: x is " + Parent.x); }
+  static int x = 99;
+  int y = 100;
+  { y++; out.print(", P-i: y is " + y); }
+}
+class Child extends Parent {
+  int x = 200;
+  static int y = 300;
+  Child() { super(y); }
+  Child(int x) { this(); }
+  { out.print(", C-i x: is " + x); }
+  static { out.print(", C-si: y is " + y); }
+}
+class InitOrder3 {
+  public static void main(String[] args) {
+    out.print("Hello!");
+    new Child(-1);
+    out.println(" Goodbye!");
+  }
+}
+public class Q {
+}

src/main/java/initialization/Example.java

@@ -12,7 +12,8 @@ class Parent {
 class Child extends Parent {
   int x = 200;
   static int y = 300;
-  Child() { super(x); }
+//  Child() { super(x); }
+  Child() { super(100); } // avoid the compilation failure!
   Child(int x) { this(); }
   { out.print(", C-i x: is " + x); }
   static { out.print(", C-si: y is " + y); }

src/main/java/initialization/LazyLoad.java

@@ -0,0 +1,68 @@
+package initialization;
+
+class LazyP {
+  int p = getOneHundred();
+  static {
+    System.out.println("loading LazyP");
+  }
+  int getOneHundred() {
+    System.out.println("LazyP getOneHundred");
+    return 100;
+  }
+  int getP() {
+    return p;
+  }
+}
+class Lazy extends LazyP {
+  {
+    System.out.println("running instance init in Lazy (1), x is " + this.x);
+  }
+  int x = 100;
+  {
+    System.out.println("running instance init in Lazy (2), x is " + x);
+  }
+
+
+  public Lazy() {
+    super();
+    // right here, compiler adds "instance initialization"
+    System.out.println("back from super()");
+  }
+  public Lazy(int x) {
+    this();
+    // nothing special here... it all happened in and immediately after
+    // super() call above
+  }
+  static int getValue() {
+    System.out.println("getting value");
+    return 10;
+  }
+  static {
+    System.out.println("loading Lazy, value is " + Lazy.value);
+  }
+  static int value = getValue();
+  static {
+    System.out.println("loading Lazy (step 2), value is " + Lazy.value);
+  }
+
+  int val = 200;
+  @Override
+  int getOneHundred() {
+    return val;
+  }
+}
+
+public class LazyLoad {
+  public static void main(String[] args) {
+    System.out.println("step 1");
+    Lazy l;
+    System.out.println("step 2");
+    System.out.println("Class of Lazy is " + Lazy.class);
+    System.out.println("step 3a");
+    System.out.println(Lazy.value);
+    System.out.println("step 3");
+    l = new Lazy();
+    System.out.println("step 4");
+    System.out.println("p value is " + l.p);
+  }
+}