常用的Java功能代碼

1、String 和 int 互轉

//integer to numeric string  
String a = String.valueOf(2);

//string to an int 
int i = Integer.parseInt(a); //numeric

2、在Java中將Array轉換成Map

   1: import java.util.Map;  

   2: import org.apache.commons.lang.ArrayUtils;  

   3:  

   4: public class Main {  

   5:  

   6: public static void main(String[] args) {  

   7: String[][] countries = { { "United States", "New York" }, { "United Kingdom", "London" },  

   8: { "Netherland", "Amsterdam" }, { "Japan", "Tokyo" }, { "France", "Paris" } };  

   9:  

  10: Map countryCapitals = ArrayUtils.toMap(countries);