[Java 소스] 더하기 연산 Program.java public class Program { public static void main(String[] args){ exAdd(); } private static void exAdd() { int i = 4; int j = 5; int re = 0; re = i+j; System.out.println("1. re:"+ re); String s1 = "Hello"; String s2 = "World"; String s3; s3 = s1 + s2; System.out.println("2. s3:"+ s3); }} 실행 결과1. re: 9 2. s3: HelloWorld 본문[Java] 2.2.1 산술 연산