과제 곱하기 절차

package org.javaro.lecture; public class P1_1 { public static void main(String[] args) { System.out.println("조병수-20191016-객체"); System.out.println("\n[절차 프로그램]"); double x, y; x=10; y=20; System.out.println("곱하기="+x*y); } }

실행창

lobster

과제 곱하기 함수

package org.javaro.lecture; public class P1_2 { public static void main(String[] args) { // TODO Auto-generated method stub System.out.println("조병수-20191016-객체"); System.out.println("\n[함수 프로그램]"); double x, y; x=10; y=20; System.out.println("곱하기="+mul(x,y)); } static double mul(double a, double b) { return a*b; } }

실행창

lobster

과제 곱하기 객체

package org.javaro.lecture; public class P1_3 { public static void main(String[] args) { // TODO Auto-generated method stub System.out.println("조병수-20191016-객체"); System.out.println("\n[객체 프로그램]"); double x, y; x=10; y=20; P7_1_1 pr1 = new P7_1_1(); pr1.b = x; pr1.c = y; System.out.println("곱하기="+pr1.mul()); } } class P7_1_1{ int a ; double b, c; public double mul() { return b*c; } }

실행창

lobster

과제 곱하기 자바빈

package org.javaro.lecture; public class P1_4 { public static void main(String[] args) { // TODO Auto-generated method stub System.out.println("조병수-20191016-객체"); System.out.println("\n[자바빈 프로그램]"); double x, y; x=10; y=20; P7_1_2 pr2 = new P7_1_2(); pr2.setB(x); pr2.setC(y); System.out.println("곱하기="+pr2.mul()); } } class P7_1_2{ int a ; double b, c; void setA(int x) { a = x; } void setB(double y) { b = y; } void setC(double z) { c = z; } public double mul() { return b*c; } }

실행창

lobster