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    <p>Here's a more idiomatic way of doing it (using the Cloneable interface):</p> <pre><code>public class Register implements Cloneable { private boolean[] register; public Register(boolean[] register) { int n = register.length; if (n == 8 || n == 16 || n == 32 || n == 64) { this.register = register; } else { throw new IllegalArgumentException( "A register can only contain 8, 16, 32, or 64 bits"); } } @Override public String toString() { StringBuilder builder = new StringBuilder(); for ( boolean b : this.register ) { builder.append( b ? "1" : "0" ); } return builder.toString(); } public Register( int n ) { this( new boolean[n] ); } public int getLength() { return this.register.length; } @Override public Register clone() { boolean[] clonedRegister = new boolean[this.register.length]; System.arraycopy(this.register, 0, clonedRegister,0, this.register.length); return new Register( clonedRegister ); } } </code></pre> <p>And a JUnit test showing it in action:</p> <pre><code>import org.junit.Assert; import org.junit.Test; public class RegisterTest { @Test public void testRegisterToString() { Register source = new Register( new boolean[] {true, true, false, false, true, false, true, false } ); String result = "11001010"; Assert.assertEquals( result, source.toString() ); } @Test public void testRegisterCloning() { Register source = new Register( new boolean[] {true, true, false, false, true, false, false, false } ); Register clone = source.clone(); Assert.assertEquals( source.toString(), clone.toString() ); } } </code></pre>
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    1. USMaurício Linhares
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    1. CONice code. It just needs the copy constructor that was the subject of OP's original post. :)
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    2. COi need to use a constructor though >.> thank you for the answer though it really helps me understand my own program even better.
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    3. COIt's bad design to have a copy constructor when the language itself defines a Cloneable interface and asks people to implement it when the "cloning" pattern is necessary :)
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