수업

//상속이 필요한 예제프로그램 class A extends Object{//extends Object가 생략되어있음. public void aaa() { System.out.println("aaa클래스"); } } public class Exam01 { public static void main (String[] ar) { A ap=new A(); System.out.println("클래스="+ap.getClass()); System.out.println("클래스="+ap.toString()); System.out.println("클래스="+ap); } } 결과: 클래스=class A 클래스=A@41a4555e 클래스=A@41a4555e //꼭 상속이 필요한 이유에 대한 프로그램예제임. class AA{..

//다차원배열에서 데이터값을 임의로 강제로 주고자할때...(동적배열) public class Exam20 { public static void main(String[] ar) { int[][] a=new int[3][]; a[0]=new int[4]; a[1]=new int[6]; a[2]=new int[2]; for(int i=0;i100) { System.out.println("예외발생"); Exception ex=new Exception(">100"); throw ex; } System.out.print("su2="); su2=Integer.parseInt(in.readLine()); tot=su1/su2; System.out.println("tot="+tot); } } 결과: ar[2]c su1=..

public class EXAM01 { public static void main (String[] ar) { for(int i=100;ifalse //byte,shart,int -->0 //char -->0,'\0' //float --->0.0f System.out.print("x="); x[0]=Integer.parseInt(in.readLine()); System.out.print("y="); x[1]=Integer.parseInt(in.readLine()); System.out.print("z="); x[2]=Integer.parseInt(in.readLine()); System.out.println(); System.out.println("x="+x[0]); System.out.println("..

Exam01 class A{} public class Exam01 { public static int sum(int n,int m) { return n + m; }//메소드 public static void main(String[] ar) { int i; int s; char a; i=10;// int는 정수타입인데 실수가나와서 오류됨 int n=19; int m=015;//8진법..5*8^0+1*8^1=13 int k=0x15;//16진법..5*16^0+1*16^1=21 int b=0b0101;//1*2^0+0*2^1+1*2^2+0*2^3=5 byte c=127;//-128~+127 long g=24L; double e=1234E-4;//=1234/10000 float aa=0.1234f;//f를 붙여..

Exam01 package java1; public class Exam01 { public static void main(String[] ar) { System.out.println("ar.length="+ar.length); } } Exam02 package java1; public class Exam02 { public static void main(String[] ar) { String name = "kitae Hwang"; String age = "20 years old"; String job = "Department of Computer Engineering"; System.out.println(name); System.out.println(age); System.out.println(job);..