几道java基础题

1.public static void main(String[] args) {  
         String classPath = "java.lang.String";  
         System.out.println(classPath.replaceAll(".", "/"));  
}

2.public static void main(String[] args) {  
         StringBuilder sb = new StringBuilder();  
         switch(1) {  
    case 1 : sb.append("Hello a");  
    case 2 : sb.append("b");  
    case 3 : sb.append("c");  
    default : sb.append("d");  
          }  
          System.out.println(sb.toString());  
}

3.public class Increment {  
    public static void main(String[] args) {  
        int j = 0;  
        for (int i = 0; i < 100; i++)  
            j = j++;  
        System.out.println(j);  
    }  
}

4.import java.util.*;  
 
public class DatingGame {  
    public static void main(String[] args) {  
        Calendar cal = Calendar.getInstance();  
        cal.set(1999, 12, 31); // Year, Month, Day  
        System.out.print(cal.get(Calendar.YEAR) + " ");  
 
        Date d = cal.getTime();  
        System.out.println(d.getDay());  
    }  
}
待续中...