[Java] 자바 문서

구글에 "api documentation java" 검색

docs.oracle.com/javase/7/docs/api/

Java Platform SE 7

 

 

클래스

public class ClassApp {
 
    public static void main(String[] args) {
         
        System.out.println(Math.PI); //3.141592653589793
        System.out.println(Math.floor(1.6)); //1.0
        System.out.println(Math.ceil(1.6)); //2.0
 
    }
 
}

 

인스턴스

import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.PrintWriter;
public class InstanceApp {
 
    public static void main(String[] args) throws IOException{
         
        PrintWriter p1 = new PrintWriter("result1.txt");
        p1.write("Hello 1");
        p1.close();
         
        PrintWriter p2 = new PrintWriter("result2.txt");
        p2.write("Hello 2");
        p2.close();
    }
}