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NLP-AI Java Lecture No. 9

NLP-AI Java Lecture No. 9. Satish Dethe <satishd@cse.iitb.ac.in>. Contents. Objects & Class (Revision) Methods String Class. nlp-ai@cse.iitb. Object & Class. Examples : Class : Object : Man Abdul Kalam Fruit Banana Language Java, Marathi Car Maruti 800, Santro

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NLP-AI Java Lecture No. 9

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  1. NLP-AIJava Lecture No. 9 Satish Dethe <satishd@cse.iitb.ac.in>

  2. Contents • Objects & Class (Revision) • Methods • String Class nlp-ai@cse.iitb

  3. Object & Class Examples : Class : Object : Man Abdul Kalam Fruit Banana Language Java, Marathi Car Maruti 800, Santro Fort Lohgadh, Raigadh Software Lab CFILT, TCS, CFDVS Shooter Major Rajvardhan Singh Rathore nlp-ai@cse.iitb

  4. Object & Class …. These objects have different colors, locations & sizes. Do they belong to the same class? nlp-ai@cse.iitb

  5. Object & Class …. • Class denotes category of objects, and act as blueprint for creating such objects. • Object of same class have same structure, it exhibits properties & behaviors defined by its class. • Properties is also called as attributes/fields & behaviors as methods/operations.

  6. Class & Objects … Class : Attributes: Hair, eyes, face, Neck, torso, hands, legs. Fingers, height, weight, age. Methods: walk(), talk(), point(), Laugh(), cry(), dance(), steady() [Definition of Class Man] man.java

  7. Object & Class … nlp-ai@cse.iitb

  8. Method • Need for Method • General Syntax • <return type><method name>(<parameter list>) • { //method body • <statement(s)> • } • NOTE:Methods are always declared inside class. • Return type is void if not returning anything, else concern data-type. • Modify man.java nlp-ai@cse.iitb

  9. Method Examples void hello(String guest){ //not returning anything System.out.println(“Oh! Hello ” + guest); } int ReturnSquare (int a_number){ //returning data of type int int square = a_number * a_number; return square; } Refer : sayHello.java nlp-ai@cse.iitb

  10. String Class • String is a very special class in Java. • Strings are constants, their values cannot be changed after they are created. But they can be reinitialize. • String here=“I am here”; • here=“I am there”;//previous one is completely deleted • Our rules and dictionaries can be stored string class. • This class is armed with useful methods…. • compareTo(String str), concate(String str), endsWith(String str), • indexOf(int ch), length(), startsWith(String str), • lastIndexOf(String str). nlp-ai@cse.iitb

  11. String Class… String machine = “pentium”; int comp = machine.compareTo(“pentium”); //comp=0; String lab= “Language”; lab=lab.concate(“ Technology”); //lab=“Language Technology”; int ind = machine.indexOf(‘t’); boolean start = machine.startsWith(“pen”); //true boolean end = machine.endsWith(“um”); //true String part1=machine.substring(0,3); //part1=“pen”; String part2=machine.substring(5);//part2=“um”; Refer str1.java, reg.java nlp-ai@cse.iitb nlp-ai@cse.iitb

  12. Assignments • Mention your own class with some attributes & methods.(do not implement). • Enhance reg.java’s code to accept a string only of characters from A to Z. (all in Upper case.) Example: AHCD is accepted. A3HCD is rejected. 43534 is rejected. nlp-ai@cse.iitb

  13. End Thank You! nlp-ai@cse.iitb

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