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    <p>You could do:</p> <pre><code>@Override public String toString() { StringBuilder sb = new StringBuilder(); sb.append(getClass().getName()); sb.append(": "); for (Field f : getClass().getDeclaredFields()) { sb.append(f.getName()); sb.append("="); sb.append(f.get(this)); sb.append(", "); } return sb.toString(); } </code></pre> <p><em>Don't</em> use string concatenation to construct an end result from 15 data members, particularly if the <code>toString()</code> will be called a lot. The memory fragmentation and overhead could be really high. Use <code>StringBuilder</code> for constructing large dynamic strings.</p> <p>I usually get my IDE (IntelliJ) to simply generate <code>toString()</code> methods for me rather than using reflection for this.</p> <p>Another interesting approach is to use the <a href="http://projectlombok.org/features/ToString.html" rel="noreferrer">@ToString annotation from Project Lombok</a>:</p> <blockquote> <pre><code>import lombok.ToString; @ToString(excludes="id") public class ToStringExample { private static final int STATIC_VAR = 10; private String name; private Shape shape = new Square(5, 10); private String[] tags; private int id; @ToString(callSuper=true, includeFieldNames=true) public static class Square extends Shape { private final int width, height; public Square(int width, int height) { this.width = width; this.height = height; } } } </code></pre> </blockquote> <p>I find this much more preferable to, say, Jakarta Commons toString builders because this approach is far more configurable and it's also built at compile-time not run-time.</p>
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    1. COThank you for this. I would go with the first approach depending on the profiling results because the second approach uses one more library. I might have to write the toJSON for just three to four objects so I'll leave it to the profiling to decide.
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    2. CO+1 for compile time Lombok example
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      1. USThorbjørn Ravn Andersen
    3. COFor Lombok, you only need a library during compilation. As long as you don't need @SneakyThrows, thare are no runtime-dependencies in Lombok
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      1. USRoel Spilker
 

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