题目：把一个数组里的数组合全部列出，比如1和2列出来为： 1,2,12,21
代码如下：
package 递归; import java.lang.reflect.Array; import java.util.Arrays; import java.util.LinkedList; import java.util.List;/** * Created by Administrator on 2017/3/4. */public class Test { public static void main(String[] args){ String[] array=new String[]{ "1","2","3","4"}; listAll(Arrays.asList(array),""); } public static void listAll(List cadidate, String PRefix){ System.out.println(prefix); for(int i=0;i<cadidate.size();i++){ List temp=new LinkedList(cadidate); listAll(temp,prefix+temp.remove(i)); //temp是删后的列表， remove 是LinkedList所拥有的方法。 } }}结果如下：
"C:/Program Files/Java/jdk1.7.0_79/bin/java" -Didea.launcher.port=7538 "-Didea.launcher.bin.path=C:/Program Files (x86)/JetBrains/IntelliJ IDEA Community Edition 2016.1.2/bin" -Dfile.encoding=UTF-8 -classpath "C:/Program Files/Java/jdk1.7.0_79/jre/lib/charsets.jar;C:/Program Files/Java/jdk1.7.0_79/jre/lib/deploy.jar;C:/Program Files/Java/jdk1.7.0_79/jre/lib/ext/access-bridge-64.jar;C:/Program Files/Java/jdk1.7.0_79/jre/lib/ext/dnsns.jar;C:/Program Files/Java/jdk1.7.0_79/jre/lib/ext/jaccess.jar;C:/Program Files/Java/jdk1.7.0_79/jre/lib/ext/localedata.jar;C:/Program Files/Java/jdk1.7.0_79/jre/lib/ext/sunec.jar;C:/Program Files/Java/jdk1.7.0_79/jre/lib/ext/sunjce_provider.jar;C:/Program Files/Java/jdk1.7.0_79/jre/lib/ext/sunmscapi.jar;C:/Program Files/Java/jdk1.7.0_79/jre/lib/ext/zipfs.jar;C:/Program Files/Java/jdk1.7.0_79/jre/lib/javaws.jar;C:/Program Files/Java/jdk1.7.0_79/jre/lib/jce.jar;C:/Program Files/Java/jdk1.7.0_79/jre/lib/jfr.jar;C:/Program Files/Java/jdk1.7.0_79/jre/lib/jfxrt.jar;C:/Program Files/Java/jdk1.7.0_79/jre/lib/jsse.jar;C:/Program Files/Java/jdk1.7.0_79/jre/lib/management-agent.jar;C:/Program Files/Java/jdk1.7.0_79/jre/lib/plugin.jar;C:/Program Files/Java/jdk1.7.0_79/jre/lib/resources.jar;C:/Program Files/Java/jdk1.7.0_79/jre/lib/rt.jar;D:/javaPractice/xuanzhuanzuixiaoshuzi/out/production/xuanzhuanzuixiaoshuzi;C:/Program Files (x86)/JetBrains/IntelliJ IDEA Community Edition 2016.1.2/lib/idea_rt.jar" com.intellij.rt.execution.application.AppMain 递归.Test1121231234124124313132132413413421414214231431432221213213421421432323123142342341242412413243243133131231243143142323213214324324134341341234234214414124123413413242421421342342314343143124324321Process finished with exit code 0新闻热点
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