Tutorial by Examples

The "default" for constructors is that they do not have any arguments. In case you do not specify any constructor, the compiler will generate a default constructor for you. This means the following two snippets are semantically equivalent: public class TestClass { private String tes...

Constructors can be created with any kinds of arguments. public class TestClass { private String testData; public TestClass(String testData) { this.testData = testData; } } Called like this: TestClass testClass = new TestClass("Test Data"); A class can ...

Say you have a Parent class and a Child class. To construct a Child instance always requires some Parent constructor to be run at the very gebinning of the Child constructor. We can select the Parent constructor we want by explicitly calling super(...) with the appropriate arguments as our first Chi...