Java Language Constructor with Arguments


Example

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 have multiple constructors with different signatures. To chain constructor calls (call a different constructor of the same class when instantiating) use this().

public class TestClass {

    private String testData;

    public TestClass(String testData) {
        this.testData = testData;
    }

    public TestClass() {
        this("Test"); // testData defaults to "Test"
    }
}

Called like this:

TestClass testClass1 = new TestClass("Test Data");
TestClass testClass2 = new TestClass();