[JAVA-API]StringBuffer /형변환

2021.03.29 - [JAVA/JAVA(자바)설치 및 툴 이용(ECLIPSE)] - [JAVA] 자바 설치 및 환경 하기 JDK 1.8 버전

[JAVA] 자바 설치 및 환경 하기 JDK 1.8 버전

개발 환경

Window 10 

JDK 1.8

이클립스 2020_03 버전

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package ex03.stringBuffer;

public class StringBufferEx01 {
	public static void main(String[] args) {
		StringBuffer  sb = new StringBuffer();
		System.out.println(sb.hashCode());  // 366712642
		System.out.println("length     /     capacity");
		int len = sb.length();		int size = sb.capacity();
		System.out.println(len + "     /      " + size);
		
		sb.append("busan");
		len = sb.length();		size = sb.capacity();
		System.out.println(len + "     /      " + size);
		
		sb.append("happy doyeon");
		len = sb.length();		size = sb.capacity();
		System.out.println(len + "     /      " + size);
		
		sb.append("12354689 479952336");
		len = sb.length();		size = sb.capacity();
		System.out.println(len + "     /      " + size);
		
		System.out.println(sb.hashCode()); // 366712642
		
		sb.trimToSize();   //용량 크기 조정
		len = sb.length();		size = sb.capacity();
		System.out.println(len + "     /      " + size);
	}
}

 

366712642
length     /     capacity
0     /      16
5     /      16
17     /      34
35     /      70
366712642
35     /      35

 

package ex03.stringBuffer;

public class StringBufferEx2 {

	public static void main(String[] args) {
		
		StringBuffer sb = new StringBuffer("This");
		System.out.println(sb);
		
		sb.append("is pencil");//문자열 추가 
		System.out.println(sb);
		
		sb.insert(7,"my");//문자열 추가 
		System.out.println(sb);
		
		sb.replace(8,10,"your"); // 문자열 변경 (교체)
		System.out.println(sb);
		
		sb.setLength(5);
		System.out.println(sb);
		System.out.println(sb.capacity());
		
		sb.setLength(20);
		System.out.println(sb);
		}

}

 

This
Thisis pencil
Thisis mypencil
Thisis myourencil
Thisi
20
Thisi

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