int--String转换
int num=100;
1.String s1=num+"";
2.String s2=String.valueOf(num);
3.int-ingerget--string
  Integer i =new Integer(num)；
  String s3=i.toString();
4.String s4=Inter.toString(int i);


String-int
Integer.parseInt(String s)  

int--String转换
int num=100;
1.String s1=num+"";
2.String s2=String.valueOf(num);
3.int-ingerget--string
  Integer i =new Integer(num)；
  String s3=i.toString();
4.String s4=Inter.toString(int i);


String-int
Integer.parseInt(String s)