Java的常用包之六

 

基本数据类型	封装类
boolean	Boolean
byte	Byte
short	Short
int	Integer
long	Long
char	Character
float	Float
double	Double

 

public class IntegerTest
...{
        public static void main(String[] args)
        ...{
              int i=5;
              Integer in=new Integer(i);//基本类型转化为封装类型
              System.out.println(in);
              
              int j=in.intValue();
              System.out.println(in); //封装类型转化为基本类型
              
              String str=in.toString();
              System.out.println(str);//封装类型转化为String
            
              String str1="123";
              System.out.println(Integer.valueOf(str1));//String转化为封装类型
              
              int ii=6;
              Integer inn=new Integer(ii);
              String str2=inn.toString();
              System.out.println(str2);
              
              /** *//**
              String str3="55646";              
            Integer innn=Integer.valueOf(str3));
            int g=innn.intValue();
              System.out.println(innn);*/
              
              
              char c=97;
              Character ct=new Character(c);
              System.out.println(ct);
              
              char c1='a';
              Character ct1=new Character(c1);
              System.out.println(ct1);
              
              Character ct2=new Character('a');
              System.out.println(ct2);
        }
}