摘要：
示例： public class StringTraining { public static void changeStr(String str){ str = "137878"; } public static void main(String[] args){ String a = "b"; 阅读全文
摘要：
public class TimeTraining { public static void changeStr(String str){ str = "137878"; } public static void main(String[] args){ Date cur = new Date(); 阅读全文