在java jdk中, java.lang.Runtime就是經(jīng)典的單例模式。

? 以下截取Runtime部分代碼

package java.lang;import java.io.*; import java.util.StringTokenizer;/*** Every Java application has a single instance of class * <code>Runtime</code> that allows the application to interface with * the environment in which the application is running. The current * runtime can be obtained from the <code>getRuntime</code> method. * <p>* An application cannot create its own instance of this class. ** @author unascribed* @version %I%, %G%* @see java.lang.Runtime#getRuntime()* @since JDK1.0*/public class Runtime {private static Runtime currentRuntime = new Runtime();public static Runtime getRuntime() { return currentRuntime;}/** Don't let anyone else instantiate this class */private Runtime() {} }

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