011 added sources for arrays, continuing with chapter 5

LICENSE.txt

@@ -22,4 +22,4 @@ FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 AUTHORS OR COPYRIGHT HOLDERS OR APRESS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-SOFTWARE.
+SOFTWARE.

chapter04/src/main/java/module-info.java

@@ -4,4 +4,5 @@
 module chapter.four {
     requires chapter.zero;
     requires transitive java.logging;
+    exports com.apress.bgn.ch4.hierarchy;
 }

chapter05/arrays/build.gradle

@@ -0,0 +1,18 @@
+plugins {
+    id 'java-library'
+}
+
+/* module with primitive types examples */
+ext.moduleName = 'chapter.five.arrays'
+
+jar {
+    manifest {
+        attributes(
+                "Created-By": System.getProperty('java.version'),
+                "Specification-Title": "Java for Absolute Beginners",
+                "Main-Class": "com.apress.bgn.ch5.CollectionsDemo",
+                "Implementation-Version": version,
+                "Class-Path": configurations.compile.collect { it.getName() }.join(' ')
+        )
+    }
+}

chapter05/arrays/src/main/java/com/apress/bgn/ch5/ArraysDemo.java

@@ -0,0 +1,82 @@
+/*
+Freeware License, some rights reserved
+
+Copyright (c) 2018 Iuliana Cosmina
+
+Permission is hereby granted, free of charge, to anyone obtaining a copy 
+of this software and associated documentation files (the "Software"), 
+to work with the Software within the limits of freeware distribution and fair use. 
+This includes the rights to use, copy, and modify the Software for personal use. 
+Users are also allowed and encouraged to submit corrections and modifications 
+to the Software for the benefit of other users.
+
+It is not allowed to reuse,  modify, or redistribute the Software for 
+commercial use in any way, or for a user's educational materials such as books 
+or blog articles without prior permission from the copyright holder. 
+
+The above copyright notice and this permission notice need to be included 
+in all copies or substantial portions of the software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS OR APRESS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+*/
+package com.apress.bgn.ch5;
+
+import java.util.Arrays;
+
+/**
+ * @author Iuliana Cosmina
+ * since 1.0
+ */
+public class ArraysDemo {
+
+    int array[];
+
+    public static void main(String... args) {
+        ArraysDemo ad = new ArraysDemo();
+        if (ad.array == null) {
+            System.out.println("array unusable");
+        }
+
+        // after proper initialization
+        ad.array = new int[2];
+        for (int i = 0; i < ad.array.length; ++i) {
+            System.out.println("array["+ i +"]= " + ad.array[i]);
+        }
+        // setting elements explicitly
+
+        ad.array[0] = 5;
+        for (int i = 0; i < ad.array.length; ++i) {
+            System.out.println("array["+ i +"]= " + ad.array[i]);
+        }
+
+        // define array with direct initialization
+        int another[] = {1,4,3,2};
+        for (int i = 0; i < another.length; ++i) {
+            System.out.println("array["+ i +"]= " + another[i]);
+        }
+
+        //sort array
+        Arrays.sort(another);
+        for (int i = 0; i < another.length; ++i) {
+            System.out.println("array["+ i +"]= " + another[i]);
+        }
+
+        //Arrays.stream(another).forEach(element -> System.out.println(element));
+        Arrays.stream(another).forEach(System.out::println);
+
+        // multidimensional array
+        int[][] intMatrix = {{1,0},{0,1}};
+        for (int i = 0; i < intMatrix.length; ++i) {
+            for (int j = 0; j < intMatrix[i].length ; ++j) {
+                System.out.print( intMatrix[i][j] + " ");
+            }
+            System.out.println();
+        }
+    }
+}

chapter05/arrays/src/main/java/module-info.java

@@ -0,0 +1,5 @@
+/**
+ * Created by iuliana.cosmina on 3/5/18.
+ */
+module chapter.five.collections {
+}

chapter05/primitives/build.gradle

@@ -5,6 +5,11 @@ plugins {
 /* module with primitive types examples */
 ext.moduleName = 'chapter.five.primitives'
 
+dependencies {
+    compile project(':chapter04')
+    testImplementation testing.junit
+}
+
 jar {
     manifest {
         attributes(

chapter05/primitives/src/main/java/com/apress/bgn/ch5/CharLister.java

@@ -2,9 +2,9 @@
 
 public class CharLister {
     public static void main(String... args) {
-        for (int i = 0; i < 65536; ++i ) {
+        for (int i = 0; i < 65536; ++i) {
             char c = (char) i;
-            if(i%10 ==0) {
+            if (i % 10 == 0) {
                 System.out.println();
             }
             System.out.print("c[" + i + "]=" + c + " ");

chapter05/primitives/src/main/java/com/apress/bgn/ch5/NumericDemo.java

@@ -10,8 +10,46 @@ public class NumericDemo {
 
     public static void main(String... args) {
         NumericDemo nd = new NumericDemo();
+
+        // testing equality of zeroes
+        System.out.println("Int zero: " + nd.i);
+        System.out.println("Float zero: " + nd.f);
+        if (nd.i == nd.f) {
+            System.out.println("Both are zero.");
+        }
+
         System.out.println(nd);
 
+        //initializations
+        nd.b = 0b1100;
+        System.out.println("Byte binary value: " + nd.b);
+
+        nd.i = 42 ;     // decimal case
+        nd.i = 045 ;    // octal case - base 8
+        System.out.println("Int octal value: " + nd.i);
+        nd.i = 0xcafe ; // hexadecimal case - base 16
+        System.out.println("Int hexadecimal value: " + nd.i);
+
+        nd.i = 0b10101010101010101010101010101011;
+        System.out.println("Int binary value: " + nd.i);
+
+        //Java 7 syntax
+        nd.i = 0b1010_1010_1010_1010_1010_1010_1010_1011;
+        System.out.println("Int binary value: " + nd.i);
+
+        nd.l = 1000_000l; // equivalent to 1000_000L
+        System.out.println("Long value: " + nd.l);
+
+        nd.f =  5;
+        System.out.println("Integer value assigned to a float variable: " + nd.f);
+
+        nd.f =  2.5f; // equivalent to nd.f =  2.5F;
+        System.out.println("Decimal value assigned to a float variable: " + nd.f);
+
+        nd.d =  2.5d; // equivalent to  nd.d =  2.5D;
+        System.out.println("Decimal value assigned to a double variable: " + nd.f);
+
+        // implicit conversions
         short sb = nd.b;
         System.out.println("byte to short: " + sb);
 
@@ -21,30 +59,35 @@ public static void main(String... args) {
         long lb = nd.b;
         System.out.println("byte to long: " + lb);
 
-
         byte bv = 23;
         short sbv = bv;
         System.out.println("byte to short: " + sbv);
 
         int ibv = bv;
         System.out.println("byte to int: " + ibv);
 
+        // explicit conversion
         ibv = 130;
         bv = (byte) ibv;
         System.out.println("int to byte: " + bv);
 
+        // comparison and assignements between different numeric types
         nd.f = nd.l;
         nd.i = 2;
         if (nd.i < nd.d) {
-            System.out.println("yeey!");
+            System.out.println("Int smaller than double value!");
         }
 
 
-
-        float maxLongF = Float.MIN_VALUE;
-        System.out.println("max long= " + Float.MIN_VALUE);
+        float maxLongF = Long.MAX_VALUE;
+        System.out.println("max long= " + Long.MIN_VALUE);
         System.out.println("float max long= " + maxLongF);
 
+        String s = String.format("%-24s: min = %s, max = %s", Float.class, Float.MIN_VALUE, Float.MAX_VALUE);
+        System.out.println(s);
+
+        s = String.format("%-24s: min = %s, max = %s", Double.class, Double.MIN_VALUE, Double.MAX_VALUE);
+        System.out.println(s);
     }
 
     @Override

chapter05/primitives/src/main/java/com/apress/bgn/ch5/ReferencesDemo.java

@@ -1,15 +1,36 @@
 package com.apress.bgn.ch5;
 
+import com.apress.bgn.ch4.hierarchy.*;
+
 public class ReferencesDemo {
 
+
     public static void main(String... args) {
+        Performer performer = new Performer("John", 40, 1.91f, Gender.MALE);
+        Human human = performer;
+        Actor actor = performer;
+        Musician musician = performer;
+
+        //performer = musician;
+        //or
+        //performer = human;
+        //or
+        performer = (Performer) actor;
+    }
+
+    public static void main2(String... args) {
         IntContainer k = new IntContainer(42);
         IntContainer q = new IntContainer(44);
 
         swap2(k,q);
 
         System.out.println("k = " + k.getValue());
         System.out.println("q = " + q.getValue());
+
+        Performer performer = new Performer("John", 40, 1.91f, Gender.MALE);
+        Human human = new Performer("Jack", 40, 1.91f, Gender.MALE);
+        Actor actor = new Performer("Jean", 40, 1.91f, Gender.MALE);
+        Musician musician = new Performer("Jodie", 40, 1.71f, Gender.FEMALE);
     }
 
     static void swap(IntContainer a, IntContainer b) {

chapter05/primitives/src/main/java/module-info.java

@@ -2,4 +2,5 @@
  * Created by iuliana.cosmina on 3/5/18.
  */
 module chapter.five.primitives {
+    requires chapter.four;
 }

settings.gradle

@@ -5,6 +5,7 @@ include 'chapter01'
 include 'chapter03'
 include 'chapter04'
 
+include 'chapter05:arrays'
 include 'chapter05:data-types'
 include 'chapter05:data-structures'
 include 'chapter05:primitives'
@@ -33,4 +34,5 @@ rootProject.children.each { project ->
     assert project.buildFile.exists()
     assert project.buildFile.isFile()
 }
+include 'arrays'