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java oop : java api

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This commit is contained in:
haerong22
2021-03-14 17:58:24 +09:00
parent 142f77510f
commit 045f2ab5fc
1 changed files with 10 additions and 0 deletions
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10
JavaOOP/src/Java31.java
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@@ -1,3 +1,13 @@
public class Java31 { public class Java31 {
public static void main(String[] args) {
String str = "apple"; // java.lang.String str = new java.lang.String("apple");
// String 클래스의 다양한 메소드들
System.out.println(str.toUpperCase());
System.out.println(str.charAt(3));
System.out.println(str.length());
System.out.println(str.indexOf("pl"));
System.out.println(str.indexOf("px"));
System.out.println(str.replaceAll("p", "x"));
}
} }