java类型转换

//java类型转换
public class Demo2 {
public static void main(String[] args){
int num1 = 55;
int num2 =77;
String str3 = "12355588";
String str4 = "12345222";
long lnum5 = 123991122;
long lnum6 = 99121222;

//int->string
String result1 = Integer.toString(num1)+Integer.toString(num2);
System.out.println("int->string:num1+num2="+result1);
//long->int
int result2 = (int)lnum5+(int)lnum6;
System.out.println("long->int:lnum5+lnum6="+result2);
//long->string
String result3 = Long.toString(lnum5)+Long.toString(lnum6);
System.out.println("long->string:lnum5+lnum6="+result3);
//string->int
int result4 = Integer.parseInt(str3)+Integer.valueOf(str4).intValue();
System.out.println("string->int:str3+str4="+result4);
//string->long
long result5 = Long.parseLong(str3)+Long.valueOf(str4);
System.out.println("string->long:str3+str4="+result5);
}