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| package Lecture9;
import java.util.Arrays;
public class StringMain04 {
public static void main(String[] args) {
// 문자열 변환 substring
String str = "Hello World";
System.out.println("str : " + str);
String subStr = str.substring(1, 5);
System.out.println("str.substring(1, 5) : [" + subStr + "]");
subStr = str.substring(6);
System.out.println("str.substring(6) : [" + subStr + "]");
// 문자열 결합 concat
String str1 = "Hello";
String str2 = "!!!!";
str = str1 + str2;
str = str1.concat(str2);
System.out.println("str1 : " + str1);
System.out.println("str2 : " + str2);
System.out.println("concat(str1, str2) : " + str);
// 문자열 치환 replace
str = "Hello World";
System.out.println("replace() 전 : " + str);
str = str.replace("ll", "rrrrrr");
System.out.println("replace() 후 : " + str);
// 공백문자 제거 trim
str = " hello ";
System.out.println("trim() 전 [" + str + "] 길이 : " + str.length());
str = str.trim();
System.out.println("trim() 후 [" + str + "] 길이 : " + str.length());
// 소,대문자 변환 toLowerCase, toUpperCase
str = "Hello World!!!";
System.out.println("str : " + str);
System.out.println("toLowerCase() : " + str.toLowerCase());
System.out.println("toUpperCase() : " + str.toUpperCase());
// 문자열 나누기 split
str = "홍길동전:허균:조선시대";
String[] strArr = str.split(":");
System.out.println(Arrays.toString(strArr));
String ip = "192.168.5.203";
String[] ipArr = ip.split("\\."); // .을 인식하기위해서는 \\ 두개 사용해줌
System.out.println(Arrays.toString(ipArr));
// 형의 변환
int num = 123;
// String strNum = num + "";
String strNum = String.valueOf(num);
System.out.println(strNum + 10);
System.out.println(String.valueOf(true)+false);
}
}
|
