Classes
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- Words: 279
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Classes in Java
Classes • All code in a Java program is part of a class • A class has two purposes – Provide functions to do work for the programmer – Represent data
• Two kinds of things found in a class – Variables store data about the class – Methods provide programmers with ways of asking the class to do work
Defining a Class class myClass { 1. Starts with the word “class” ... 2. Followed 3. Followed ... by the class by an open ... name curly bracket 4. Followed by } method and variable What name definitions. would this 5. Followed by a close file have? curly bracket
Indenting Classes • Variables and methods in a class should be indented • Close bracket at end should be indented the same as class • Open bracket can be on same line as class or next line • Classes are usually in their own file
class myClass{ void method1(){ code } }
Formatting Java Programs • Java is case sensitive. E.g. class myclass is not the same as class MyClass. • Java is white space insensitive – Can put any number of spaces or new line characters between statements – Should use spaces to indent to make programs readable
• // (two slashes) in Java start a comment: // This is a comment – Everything from the // to the end of line is ignored
Summary • Java programs are made up of classes – Classes have variables that store data – Methods do work for the programmer
• Class definitions have multiple parts. • Java is case sensitive • Comments and extra white space are ignored
Classes • All code in a Java program is part of a class • A class has two purposes – Provide functions to do work for the programmer – Represent data
• Two kinds of things found in a class – Variables store data about the class – Methods provide programmers with ways of asking the class to do work
Defining a Class class myClass { 1. Starts with the word “class” ... 2. Followed 3. Followed ... by the class by an open ... name curly bracket 4. Followed by } method and variable What name definitions. would this 5. Followed by a close file have? curly bracket
Indenting Classes • Variables and methods in a class should be indented • Close bracket at end should be indented the same as class • Open bracket can be on same line as class or next line • Classes are usually in their own file
class myClass{ void method1(){ code } }
Formatting Java Programs • Java is case sensitive. E.g. class myclass is not the same as class MyClass. • Java is white space insensitive – Can put any number of spaces or new line characters between statements – Should use spaces to indent to make programs readable
• // (two slashes) in Java start a comment: // This is a comment – Everything from the // to the end of line is ignored
Summary • Java programs are made up of classes – Classes have variables that store data – Methods do work for the programmer
• Class definitions have multiple parts. • Java is case sensitive • Comments and extra white space are ignored
