thatqier

/*进行小写转化成大写，大写转化成小写*/public class Text { public static void main(String[] arges) { String str = "wojiaoZHANGSFANBUbcubu"; String str2 = new String("bivbjiwvbiBIBIBIUBnvnijnvou"); String str3="

1：echo $JAVA_HOME使用$JAVA_HOME的话能定位JDK的安装路径的前提是配置了环境变量$JAVA_HOME，否则如下所示，根本定位不到JDK的安装路径[root@localhost ~]# java -versionjava version "1.7.0_65"OpenJDK Runtime Environment (rhel-2.5.1.2.e