Why does my program output MyClass@1b6d3586

Contents

• Custom class
  • Reproducing the issue
  • Solution
• Array
  • Reproducing the issue
  • Solution

---

Custom class

Reproducing the issue

Given the class

class MyClass {
    
}

And given an instance of the class

MyClass instance = new MyClass();

Attempting to print the instance

System.out.println(instance)

Or attempting to append the instance to a UI element as a String

String text = instance.toString();
textField.setText(text);

Results in output similar to the following

MyClass@1b6d3586

^{(Or something similar)}

Solution

Override the toString() method in MyClass

class MyClass {
    @Override
    public String toString() {
        return "New output";
    }
}

You can output the data you desire

class MyClass {
    private String textData;
    private int numberData;

    @Override
    public String toString() {
        return textData + " " + numberData;
    }
}

You may now print your object as expected

MyClass instance = new MyClass();
System.out.println(instance);

---

Array

Reproducing the issue

Given the array

String[] array = { "one", "two" };

Attempting to print the arary

System.out.println(array);

Results in the following:

[Ljava.lang.String;@e9e54c2

^{(Or something similar)}

Solution

Use Arrays.toString to convert the array to a String

String s = Arrays.toString(array);
System.out.println(s);