[객체(9)] 실습1, 실습2

💫 실습1

package com.kh.prac1.controller;

public class StrCon {
	public void strMethod() {
		String str1 = "무궁화 꽃이 피었습니다.";//리터럴
		String str2 = new String("무궁화 꽃이 피었습니다.");//new연산자
		String str3 = new String("동해물과 백두산이");//new연산자
		
		System.out.println("======hashCode 비교======");
		System.out.println("str1 : " + str1.hashCode());
		System.out.println("str2 : " + str2.hashCode());
		System.out.println("str3 : " + str3.hashCode());
		
		System.out.println("======identityHashCode 비교======");
		System.out.println("str1 : " + System.identityHashCode(str1));
		System.out.println("str2 : " + System.identityHashCode(str2));
		System.out.println("str3 : " + System.identityHashCode(str3));
	}
}

 

package com.kh.prac1.run;

import com.kh.prac1.controller.StrCon;

public class Run {
	public static void main(String[] args) {
		StrCon sc = new StrCon();
		sc.strMethod();
	}
}
/*
======hashCode 비교======
str1 : 313772671
str2 : 313772671
str3 : 282595592
======identityHashCode 비교======
str1 : 1159190947
str2 : 925858445
str3 : 798154996
*/

 

 

💫 실습2

 

 

package com.kh.prac2.controller;

import java.util.Scanner;
import java.util.StringTokenizer;

public class SpaceUpper {
	
	public void spaceToUpper() {
		Scanner sc = new Scanner(System.in);
		System.out.print("영어를 입력하시오(띄어쓰기 포함): ");
		String str = sc.nextLine();
		StringTokenizer st = new StringTokenizer(str, " ");
		StringBuilder sb = new StringBuilder();
		String str1 = "";
		
		while(st.hasMoreTokens()) {
			String token = st.nextToken();
			for(int i=0; i<token.length(); i++) {
				if(i==0) {
					str1=token.toUpperCase();
					sb.append(str1.charAt(i));
				}
				else {
					sb.append(token.charAt(i));
				}
			}
			sb.append(" ");
		}
		System.out.println(sb);
	}
}

 

package com.kh.prac2.run;

import com.kh.prac2.controller.SpaceUpper;

public class Run {
	public static void main(String[] args) {
		SpaceUpper su = new SpaceUpper();
		su.spaceToUpper();
		
	}
}
/*
영어를 입력하시오(띄어쓰기 포함): aaa bbb ccc
Aaa Bbb Ccc 
*/