Java Language Tutorial => 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();

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Java Language

Java Language Constructors Constructor with Arguments

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