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ICSE Notes 2018 : Computer Applications (Ryan International School (RIS), Yelahanka, Bangalore)

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Aaqil Raj
Ryan International School (RIS), Yelahanka, Bangalore
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Introduction to Java & Blue Environment [ICSE Syllabus on this Topic] Not mention anything about this topic. but these questions are must be Q. Why is Java often termed as a platform? Ans: Platform is the environment in which programs execute. Instead of interacting with the Ope virtual machine provided by Java, therefore Java is often referred to as a platform also. Q. What is a bytecode? Ans: Bytecode is a set of pseudo mechanic language instructions that are understood by the JVM underlying hardware. Q. What do you understand by JVM? Ans: JVM or Java Virtual Machine is an abstract machine designed to be implemented on top of ex from Java application. Programs written in Java are compiled into Java byte-code, which is then specific platform. Actually this Java interpreter is known as Java Virtual Machine (JVM). Q. What is JDK (Java Development Kit)? Ans: The Java development kit comes with a collection of tools that are used for developing and Q. What are Java APIs? Ans: The Java APIs (Application Program Interface) consist of libraries of pre-compiled code th Q. Write the five characteristics of Java/BlueJ? Ans: 1. Write Once Run Anywhere 2. Light weight code 3. Security 4. Built in Graphics 5. Object Platform Independent. 8. Open Product. Q. What do you know about BlueJ? Ans: BlueJ is a Java development environment. It is an IDE (Integrated Development Environment viewer. Q. How you create, compile and execute a program in Java or BlueJ? Explain your answer? Ans: Create: Click on new class button from BlueJ editor, then type the class name a program i program editor will be open, erase the code and type your program coding. Compile: click the co click on the class icon and select compile from the menu options. Execute: Right click on the c dialogue box appears type the name of the object. A object icon will be created at the bottom. method we want to execute. Q. The two types of Java programs/applications are? [2007] Ans: The two types of Java Applications are 'Internet Applets' and 'Stand alone application'. Q. State the distinguishing features of Java and C++? Ans: (i) Java does (ii) Java does not (iii) There are no (iv) Java does not not support operator overloading. use pointers. header files in Java. have template classes as in C++. Q. State the differences between Syntax errors and Logical errors. Ans: The compiler can only translate a program if the program is syntactically correct; otherwi to run your program. Syntax refers to the structure of your program and the rules about that st The second type of error is a run-time error, so-called because the error does not appear until occur when the interpreter is running the byte code and something goes wrong. Q. "Object is an instance of a class", explain Ans: Object of a class contains data and functions provided in a class. it possesses all the fe instance of a class. Q. Name four basic features of JAVA. Ans: Basic features of Java as follows: i) It is an object oriented language. ii) Java program is both compiled and interpreted. iii) Java program can be application or applet. iv) java is case sensitive language, i.e. it distinguished upper and lower case letters.

 

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