bed

.vscode/launch.json

@@ -0,0 +1,42 @@
+{
+    // Use IntelliSense to learn about possible attributes.
+    // Hover to view descriptions of existing attributes.
+    // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "type": "java",
+            "name": "Debug (Launch) - Current File",
+            "request": "launch",
+            "mainClass": "${file}"
+        },
+        {
+            "type": "java",
+            "name": "Debug (Launch)-Week1_class2<H212_87e1e728>",
+            "request": "launch",
+            "mainClass": "BookProblems.Week1_class2",
+            "projectName": "H212_87e1e728"
+        },
+        {
+            "type": "java",
+            "name": "Debug (Launch)-HelloWorld<H212_87e1e728>",
+            "request": "launch",
+            "mainClass": "HelloWorld",
+            "projectName": "H212_87e1e728"
+        },
+        {
+            "type": "java",
+            "name": "Debug (Launch)-HelloWorld<H212_87e1e728>(1)",
+            "request": "launch",
+            "mainClass": "PrincetonJava.HelloWorld",
+            "projectName": "H212_87e1e728"
+        },
+        {
+            "type": "java",
+            "name": "Debug (Launch)-UseArgument<H212_87e1e728>",
+            "request": "launch",
+            "mainClass": "PrincetonJava.UseArgument",
+            "projectName": "H212_87e1e728"
+        }
+    ]
+}

BookProblems/Week1_class2.java

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+// Page 24: R1.7, R1.8, R1.9
+// Page 25: R1.13, R1.14, R1.19
+// Page 26: E1.11, E1.15
+// Page 27: E1.16, E1.17, E1.18
+// Page 28: P1.3
+package BookProblems;
+
+/**
+ * Week1_class2
+ */
+public class Week1_class2 {
+
+    // R1.7
+    public static void main(String[] args) {
+        System.out.println("======");
+        System.out.println("39 + 3");
+        System.out.println(39 + 3);
+        test();
+        // test2();
+        test3();
+    }
+    // R1.8
+    public static void test() {
+        System.out.println("======");
+        System.out.print("Hello");
+        System.out.println("World");
+    }
+
+    // R1.9  compile time error: exception in thread "main" java: method print.. in type printstream not applicable for arguments (String, String)
+    // public static void test2() {
+    //     System.out.println("Hello", "world");
+    // }
+
+    // R1.13
+
+    // R1.14
+    // R1.19
+
+    public static void test3() {
+        System.out.println("===============");
+        System.out.println("   -----   " + "  /\\_/\\   ");
+        System.out.println(" / holaa \\ " + " ( ' ' )   ");
+        System.out.println("| junior  > " + "( \\_/ )  ");
+        System.out.println(" \\ coder!/ " + "  | | |  ");
+        System.out.println("   -----   " + "  (_|_)   ");
+    }
+
+}
+

HelloWorld.java

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+/**
+ * HelloWorld
+ */
+public class HelloWorld {
+
+    public static void main(String[] args) {
+        System.out.println("Hello, World!");
+        System.out.println("H" + "\n" + "e" + "\n" + "l" + "\n" + 
+        "l" + "\n" + "o");
+    }
+}

PrincetonJava/Booknotes/Chapter1.txt

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+1.2 Built-in Data Types
+
+    Basic types
+        int
+        double
+        boolean
+        char
+        String
+
+    Literals - the value
+
+    Operators
+        and: &&
+        or: ||
+        not: !
+
+    Identifiers - instances of a data type
+
+    Variables - entity that holds value. static in java.
+
+    Declaration Statement - double totalSum;
+
+    Naming conventions - camelCase
+
+    Constant Variables - constant values. use uppercase with underscores
+        SPEED_OF_LIGHT
+
+    Expressions - 4 * (x - 3)
+
+    Operator Precedence - division, multiplication, addition, subtraction
+        Left associativity -    a - b - c == (a - b) - c
+
+    Assignment Statements - initialize variable
+        int a,b;
+        a = 1;
+        b = 2;
+        int c = a + b;
+
+    Inline initialization
+        int x = 34;
+
+Characters and Strings
+
+    char = 'a';
+    Escaped Characters
+        \t tab
+        \b backspace
+        \n newline
+        \r carriage return - returns cursor to the new line
+        \f formfeed - similar to new page or page break
+        \' single quote
+        \" double quote
+        \\ backslash

PrincetonJava/HelloWorld.java

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+package PrincetonJava;
+
+/**
+ * HelloWorld
+ */
+public class HelloWorld {
+
+    public static void main(String[] args) {
+        System.out.println("Hello, World!");
+    }
+}

PrincetonJava/UseArgument.java

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+package PrincetonJava;
+
+/**
+ * UseArgument
+ */
+public class UseArgument {
+
+    public static void main(String[] args) {
+        System.out.print("Hi, ");
+        System.out.print(args[1]);
+        System.out.println(". How are you?");
+    }
+}