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(ExY1)
DD1    EM1    Y1   Y1b    EM-Phonebook  
DD2    EM2     Y2   Yv_Examples
DD3    EM3     Y3    
DD4    EM4     Y4
DD5    EM5     Y5

****  Index of Examples
****  Back to Java Cheat

Contructor - Overloading Example
//dir ctor
class Person
{
    String m_sName;
    int m_nAge;
    Person(String sName)
    {
        m_sName = sName;
        m_nAge =200;
    }

    Person(String sName, int nAge)
    {
        m_sName = sName;
        m_nAge = nAge;
    }

    void print()
    {
        System.out.println(m_sName + " Age = " + m_nAge);
    }

    public static void main(String args[])
    {
        new Person("Shaul", 23);   
    }
};

dir intro
array example
//dir intro

class 2DimArr
{
    public static void main(String args[])
    {
        int arr[][] = new int[5][5];
        System.out.println(arr.length);
        System.out.println(arr[0].length);

        int arr2[][] = new int[5][];
        for (int i = 0 ; i < arr2.length ; ++i )
        {
            arr2[i] = new int[i + 1];
        }

    }
};

Parsing Console Input
//dir intro

class Ex2
{
    public static void main(String args[])
    {
        /*
        int i = 0;
        int j = 33;
        boolean b = true;
        long l = 3l;
        double d = 2.3;
        float f = 2.3f;
        System.out.println(j);
        */
        int nUserVal = Integer.parseInt(args[0]);
        nUserVal += 10;
        System.out.println(nUserVal);
    }
};


Some String Methods (Yvonne)
class Ex3
{
    public static void main(String args[])
    {
        String s1 = "Hello";
        String s2 = " World".toUpperCase();
        String s3 = s1 + s2;
        String myConcatated="";
        String try1, try2;
        myConcatated = s1+s2+" "+s3;
        System.out.println("This illustrates that the substring The substring begins at the specified beginIndex and extends to the character at index endIndex - 1");
        System.out.println("myConcatated="+myConcatated);
        System.out.println("myConcatated.substring(0,4))="+myConcatated.substring(0,4));
        System.out.println("myConcatated.substring(1,4))="+myConcatated.substring(1,4));
        System.out.println("myConcatated.substring(0,5))="+myConcatated.substring(0,5));
        System.out.println("myConcatated.substring(1,5))="+myConcatated.substring(1,5));
        System.out.println("myConcatated.substring(5))"+myConcatated.substring(5));
        System.out.println("myConcatated.toUpperCase()="+myConcatated.toUpperCase());
        System.out.println("myConcatated.toUpperCase()="+myConcatated.toLowerCase());
        System.out.println("myConcatated.substring(5))"+myConcatated.substring(5));
        System.out.println("Did you notice the empty space at the beginning?????)::"+myConcatated.substring(5));
        //s4 = s4.toUpperCase();
        System.out.println("Try Trim!! myConcatated.substring(5).trim()="+myConcatated.substring(5).trim());
        //s4 = s4.toUpperCase();
        //s4 = s4.trim();
        //s4 = s4.subString(2);
        //System.out.println(s4);
    }
};

for statement
//dir intro

class Ex4
class Ex4
{
    public static void main(String args[])
    {
        String s = "";
        for (int i = 0 ; i < 10 ; ++i)
        {
            s += i;
            System.out.println("s="+s);
        }
    }
}

/***

Method void main(java.lang.String[])
   0 ldc #2 <String "">
   2 astore_1
   3 iconst_0
   4 istore_2
   5 goto 30
   8 new #3 <Class java.lang.StringBuffer>
  11 dup
  12 invokespecial #4 <Method java.lang.StringBuffer()>
  15 aload_1
  16 invokevirtual #5 <Method java.lang.StringBuffer append(java.
  19 iload_2
  20 invokevirtual #6 <Method java.lang.StringBuffer append(int)>
  23 invokevirtual #7 <Method java.lang.String toString()>
  26 astore_1
  27 iinc 2 1
  30 iload_2
  31 ldc #8 <Integer 100000>
  33 if_icmplt 8
  36 return
*/

String Buffer Append
//dir intro

class Ex4Improved
{
    public static void main(String args[])
    {
        StringBuffer s = new StringBuffer();
        for (int i = 0 ; i < 100000 ; ++i)
        {
            s.append(i);
        }
        String s2 = s.toString();
    }
}
/***
Method void main(java.lang.String[])
   0 new #2 <Class java.lang.StringBuffer>
   3 dup
   4 invokespecial #3 <Method java.lang.StringBuffer()>
   7 astore_1
   8 iconst_0
   9 istore_2
  10 goto 22
  13 aload_1
  14 iload_2
  15 invokevirtual #4 <Method java.lang.StringBuffer append(int)>
  18 pop
  19 iinc 2 1
  22 iload_2
  23 ldc #5 <Integer 100000>
  25 if_icmplt 13
  28 aload_1
  29 invokevirtual #6 <Method java.lang.String toString()>
  32 astore_3
  33 return
 */

more arrays, int arrays, byte arrays
//dir intro

class Ex5
{
    public static void main(String args[])
    {
        int arr[];
        arr = new int[3];
        int temp[] = new int[6];
        for (int i = 0 ; i < 3  ;  ++i)
        {
            temp[i] = arr[i];
        }
        arr = temp;
        byte b[] = new byte[1024];

    }
};

parsing arguments
//dir intro

class Ex6
{
    public static void main(String args[])
    {
        for (int i = 0 ; i < args.length ; ++i )
        {
            System.out.println(args[i]);
        }
    }
};

parsing args, IF
//dir intro
class IfStatement
{
    public static void main(String args[])
    {
        int i = args.length;
        if (i > 0)
        {
            System.out.println(args[0]);
        }
    }
}

Thread.sleep
//dir intro
class Main
{
    public static void main(String args[]) throws InterruptedException
    {
        System.out.println("Hello Java");
        Thread.sleep(10000);
        System.out.println("Done");
    }
};


//dir intro

class Test
{
    public static void main(String args[])
    {
        int arr[] = new int[Integer.MAX_VALUE / 1000];
    }
};

dir /mem
//dir mem

class BigObject
{
    int arr[][] = new int[50][50];
    static int counter;
    BigObject()
    {
       
        System.out.println("BigObject was created" + counter++);
    }
   

    public void finalize()
    {
        System.out.println("##### BigObject was deleted" + counter--);
    }


    public static void main(String args[])
    {
        while(true)
        {
            new BigObject();
            System.gc();
        }
    }
};

dir obj base
//dir obj base

class Application
{
    public static void main(String args[])
    {
        PhoneBook book = new PhoneBook();
        Person p = new Person();
        p.setPhoneNumber("03-6543215");
        p.setName("Goofee");
        book.addPerson(p);
        book.addPerson(p);
        Person p2 = new Person();
        p2.setPhoneNumber("03-1111111");
        p2.setName("Goofee 2");
        book.addPerson(p2);
        book.print();
        PhoneBook book2 = new PhoneBook();
        book2.addPerson(p);

        //addPerson(PhoneBook, Person)
    }
};


//dir obj base

class Person
{
    String m_sName;
    String m_sPhone;
    void setPhoneNumber(String phone)
    {
        m_sPhone = phone;
    }

    void setName(String name)
    {
        m_sName = name;
    }

    void print()
    {
        System.out.println("Name = " + m_sName +
                            " Phone = " + m_sPhone);
    }
};


//dir obj base

class PhoneBook
{
    Person arr[] = new Person[100];
    //Dim arr as Person(100)
    int nNumOfPersons = 0;

    void addPerson(Person p) //param0 -> this (PhoneBook),
                             //Person p
    {
        if (nNumOfPersons < arr.length)
        {
            arr[nNumOfPersons++] = p;
        }
    }

    void print()
    {
        System.out.println("Num of persons in book = "
            + nNumOfPersons);
        for (int i = 0 ; i < nNumOfPersons ; ++i )
        {
            Person personToPrint = arr[i];
            personToPrint.print();
            //arr[i].print();
        }
    }
};

dir StatObj

//dir StatObj

class Ex1
{
    static Ex1 Instance;
    static {
        Instance = new Ex1();
    }

    static Ex1 getInstance()
    {
        return Instance;
    }

    void m1()
    {
        System.out.println("In m1");
    }

    void m2()
    {
        System.out.println("In m2");
    }

    static void main(String args[])
    {
        Ex1.Instance.m1();
        Ex1.Instance.m2();
    }

};


//dir StatObj

class MyInt
{
    private int m_nValue;

    void setValue(int nValue)
    {
        m_nValue = nValue;
    }

    int getValue()
    {
        setValue(m_nValue);
        return m_nValue;
    }

    static int parseInt(String s)
    {
        return Integer.parseInt(s);
    }

    public static void main(String args[])
    {
       
        MyInt.parseInt("123");
    }
};


//dir StatObj


class Sample
{
    static int statInt;
    void m1()
    {
        statInt = 2;
        int i = 3;
    }

    static void m2()
    {
        statInt = 3;
        Sample s = new Sample();
        s.m1();
        int i = 3;
    }
};






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