13일차 String

package com.test;

public class StringStudy {

	public static void main(String[] args) {
                //"안녕하세요"는 CharSequence char='b'
		
		//String a="안녕하세요";//오토박싱 
		//String 은 스트링 class
		
		String a="안녕하세요";
		String b="ABCDEFG";
		String c="abcdefg";
		int x=10;
		
		int length=a.length();
		System.out.println("length= "+length);
	
		boolean equals=b.equals(c);
		System.out.println("equals= "+equals);
		
		//case 문자, UpperCase 대문자, LowerCase 소문자
		
		boolean equalsIgnore = b.equalsIgnoreCase(c);
		System.out.println("equalsIgnore= "+equalsIgnore);
										  // 0 1 2 3 4			
		String subString = a.substring(3);// 안 녕 하 세 요
		System.out.println("subString= "+subString);
		
		subString = a.substring(2,4);
		System.out.println("subString= "+subString);
		
		System.out.println(a.concat(b));//concat-붙이다.
		
		System.out.println(a.replace('녕','용'));
		
		System.out.println(b.toLowerCase());
		
		System.out.println(c.toUpperCase());
		
		System.out.println(c.charAt(0));
		
		System.out.println(c.indexOf(0));//0의 위치는?
		System.out.println(a.indexOf("하"));//"하"의 위치는?
		
		System.out.println(a.lastIndexOf(5));//아스키코드
		
		String d="   안녕   ";
		System.out.println(d);
		System.out.println(d.trim());
		
		int k=5555;
		System.out.println( String.valueOf(k));
	}
}