下面的例子，展示了如何合理布局一个包含单一公共类的Java源程序。接口的布局与其相似。更多信息参见 类和接口声明 和 注释。
/*
* @(#)Blah.java 1.82 99/03/18
*
* Copyright (c) 1994-1999 Sun Microsystems, Inc.
* 901 San Antonio Road, Palo Alto, California, 94303, U.S.A.
* All rights reserved.
*
* This software is the confidential and proprietary information of Sun
* Microsystems, Inc. ("Confidential Information"). You shall not
* disclose such Confidential Information and shall use it only in
* accordance with the terms of the license agreement you entered into
* with Sun.
*/
package java.blah;
import java.blah.blahdy.BlahBlah;
/**
* Class description goes here.
*
* @version 1.82 18 Mar 1999
* @author Firstname Lastname
*/
public class Blah extends SomeClass {
/* A class implementation comment can go here. */
/** classVar1 documentation comment */
public static int classVar1;
/**
* classVar2 documentation comment that happens to be
* more than one line long
*/
private static Object classVar2;
/** instanceVar1 documentation comment */
public Object instanceVar1;
/** instanceVar2 documentation comment */
protected int instanceVar2;
/** instanceVar3 documentation comment */
private Object[] instanceVar3;
/**
* ...constructor Blah documentation comment...
*/
public Blah() {
// ...implementation goes here...
}
/**
* ...method doSomething documentation comment...
*/
public void doSomething() {
// ...implementation goes here...
}
/**
* ...method doSomethingElse documentation comment...
* @param someParam description
*/
public void doSomethingElse(Object someParam) {
// ...implementation goes here...
}
}