JAVA Chapter - 03

 

SHORT NOTES  ----------

//__________________________________ CHAPTER - 3 (String in Java)  _______________________________
//      1. String name = new String("Harry"); iske place pe hm lik skte hain yeh nicke wala
        //String name = "harry ";
        //System.out.println(name);

//       2. Different Ways to Print in Java --
        //System.out.println("Bhavik kalu ");     // println = print ke aage new line
        //System.out.print("BHavik kalu");       // print = koi line print nhi hogi
        //int a =4;
        //float b = 5.89389f;
        //System.out.printf("the value of a is %d and the value of b is %f" , a , b );
        //System.out.format("the value of a is %d and the value of b is %f" ,a ,b );
        // printf = format mtlb dono same he kaam krte hain
        //aager mein %f ke place pe %.2f lik du toh iska mtlb 2 point decimal tk show krega
        //aager mein %f ke place pe %8.2f lik du toh 8 ka space dega (including numbers ) aur 2 digit
        // tk decimal show krega
        // %d ka mltb jo value int hai aur % f ka mtlb joh value float hain
        /*
        %d = int
        %f = float
        %c = char
        %s = string
         */
//       3. String Methods ----------
           //Lenght of String -
        /*String name = "vipul";
        System.out.println(name);
        int value = name.length();
        System.out.println(value);*/
          //Lower case -
        /*String name ="VIPUL";
        System.out.println(name );
        String lower = name.toLowerCase();
        System.out.println(lower);*/
          //Upper Case -
        /*String name = "vipul";
        System.out.println(name);
        String upper = name.toUpperCase();
        System.out.println(upper);*/
          //TRIM - trim empty spaces from the string
        /*String name = "Vipul      ";
        System.out.println(name );
        String trim =name.trim();
        System.out.println(trim);*/
          // Substring -
        /*String name = "vipul ";
        System.out.println(name );
        String substring = name.substring(2);
        String substring = name.substring(2,4);
        System.out.println(substring);*/
          // Replace -
        /*String name ="Vipul";
        System.out.println(name);
        System.out.println(name.replace('p','k'));
          // Starts/Ends with -
        System.out.println(name.startsWith("Vi"));
        System.out.println(name.endsWith("ul"));
          //Char Position -
        System.out.println(name.charAt(3));
          // Indexs of -
        System.out.println(name.indexOf("pu"));
        System.out.println(name.indexOf("pu",1)); // 1 ka mtlb 1 se start kro indexing
          // last indes of -
        System.out.println(name.lastIndexOf("u"));
        System.out.println(name.lastIndexOf("u",0));
          // Equals -
        System.out.println(name.equals("Vipul"));
          // Equals ignore case -
        System.out.println(name.equalsIgnoreCase("vipul"));


//      4. Escape Sequence Character -
        System.out.println("i am escape sequence \" ");*/ //mltb print ke statment mein aager koi bhi symbol add krna hai
        //jesa double quote , sing quote , slash , back slash , kuch hbi toh usse phela aak backsalsh lagana zaruri hain

// EXERCISE - 3 ________________
// Question-1 Write a java program to convert a string to lowercase
       /* String name = "Vipul";
        System.out.println(name.toLowerCase());*/
// Question-2 Write a java program to replace spaces with underscores
        /*String name = "  Vipul";
        System.out.println(name.replace(' ','_'));
// Question-3 Write a java program to fill i a letter template which looks like below
        String letter = "Dear <|name |> , Thanks a lot " ;
        letter = letter.replace("<|name|>","Vipul");
        System.out.println(letter);*/
// Question-4 Write a java program to detect double and triple spaces in the string
        String name ="Vipul   ";
        System.out.println(name.indexOf("   "));

// Question-5 Write a program to format the following letter using sequece character
        String letter ="Dear Harry,\n\tThis java Course us nice.\n\tThanks! ";
        System.out.println(letter);

DONLOAD NOTES FROM CODE WITH HARRY _______