JSpiders - Wrapper classes
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Java is not purely object-oriented as it uses primitive data types like int and double that are not objects. Wrapper classes like Integer and Double allow primitive types to be used as objects. Wrapper classes wrap a primitive type and provide object-oriented functionality like methods. Wrapper classes are used when primitive types need to be added to collections or converted between primitive and object types.
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This document contains sample question papers for an exam to become a clerk at Oriental Bank of Commerce. It includes 5 parts for the English section testing grammar, vocabulary, and comprehension. It also has 5 parts for the Mathematics section testing numerical ability. Finally, it has 3 parts for the Reasoning section testing critical thinking.
JSpiders BTR Cw emocktest
The document provides information about the Common Written Examination (CWE) conducted by the Institute of Banking Personnel Selection (IBPS) for selection to probationary officer/management trainee positions in 19 participating public sector banks in India. Some key details include:
- IBPS administers the CWE twice per year on behalf of the participating banks.
- The CWE consists of objective tests on reasoning, English language, quantitative aptitude, general awareness, computer knowledge, and a descriptive paper.
- Candidates who meet the minimum score thresholds will receive scorecards and can then apply to participating banks for further selection processes including interviews.
- Each participating bank will conduct its own subsequent selection process and have
JSPiders Common written exam (cwe) for various public sector banks in india s...
JSPiders Common written exam (cwe) for various public sector banks in india s...JSpiders Basavanagudi
The document contains a sample question paper for the Common Written Exam (CWE) for various public sector banks in India. The question paper contains sections on English, Reasoning, and Quantitative Aptitude (Mathematics). Each section has multiple choice questions testing skills in grammar, reading comprehension, logical reasoning, data interpretation, and mathematical problem solving abilities required for banking jobs.Aptitude
This document provides an introduction to aptitude tests for IT companies. It explains that aptitude tests are designed to predict an individual's ability to learn new skills and how efficiently they can apply them. It emphasizes that mastering aptitude tests is important for gaining confidence and momentum to succeed in later interview stages. The document outlines preparation strategies and important concepts that will be covered, such as calculations, problem-solving techniques, speed, and guiding principles like self-motivation. It concludes by welcoming student feedback to help make the content as clear and interesting as possible.
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JSpiders BTR Oriental bank of commerce clerical sample question paper all ...
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JSPiders Common written exam (cwe) for various public sector banks in india s...
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- 2. • Java is not pure object oriented. • Any language which makes use of primitive type of data such languages are not object oriented. • Few purely object oriented languages are Ex: Scala, Smalltalk, Eiffel ..etc • The primitive data types are not objects, they do not belong to any class. • Sometimes, it is required to convert data types into objects in Java language. • A data type can be converted into an object and then used with the help of Wrapper Classes.
- 3. • A wrapper class wraps (encloses) around a data type and gives it an object appearance. • Wherever, the data type is required as an object, Wrapper class object can be used. • Wrapper classes include methods to unwrap the object and give back the data type.
- 4. • It can be compared with a chocolate. The manufacturer wraps the chocolate with some foil or paper to prevent from pollution. The user takes the chocolate, removes and throws the wrapper and eats it.
- 5. To wrap (or to convert) each primitive data type, there comes a wrapper class. Eight wrapper classes exist in java.lang package that represent 8 data types. Following list gives.
- 7. • All wrapper classes are final classes. • All Wrapper classes implements comparable type. • All wrapper classes overrides 3 object class methods 1.toString() 2.hashCode() 3.equals(Object obj)
- 8. Conversion of primitive data to object type is known as Boxing. EX: int k = 100; Integer it1 = new Integer(k); double d = 3.3; Double dt2= new Double(d); Conversion of Object type of data to Primitive type is called as Un-Boxing. EX: int m = it1.intValue(); System.out.println(m); // prints 100 double n = dt2.doubleValue(); System.out.println(n); // prints 3.3
- 9. Boxing and Un-Boxing Can be done implicitly by compiler, it is known as Auto Boxing and Auto Un-Boxing. Integer a1=30; Auto Boxing int l= a1; Auto Un-Boxing
- 10. Wrapper Classes In Collection FrameWorks • Wrapper Classes are used in collection framework. • In Collection we can add only Object type of data. • If primitive data added in Collection Framework then auto boxing and auto un-boxing both happens Implicitly. Ex: ArrayList a1 = new ArrayList(); a1.add(12); a1.add(2356); a1.add(4.5); • Here First auto boxing happens and then up-casting to Object class happens.
- 11. Parsing Technique • Conversion of String type of data to Number format is called as Parsing • For Parsing we make use of parseX() methods which are present in Wrapper classes. Ex: String str = “1234”; int i = Integer.parseInt(str); System.out.println(i); // 1234 • Parsing has to be done carefully, else we may get Exception. • In previous example if String value is “1234g” ,in this case during parsing the value doesn’t match with Integer hence we get NumberFormatException.