자바초급 수업 2일제 메서드 생성자 정의

String str="abcd";
int i=str.indexof("bc");




class String{
int indexof(String str1){

}
}

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String str="abcd";
char[] arr=str.tocharArray();
for(int i=0 ; i Sys.....................(arr[i])





class String{
char[] tocharArray(){

}
}

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String str="a,b,c,d"
String str2=str.substring(1,3)
Sy.......................(str2);



class String{
String substring(int i, int j){

}
}

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String s=Integer.toBinaryString(10);

class Integer{
static String toBinaryString(int i){ //static Integer라는 클래스명으로 직접 접근하였다.
}
}


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double d=MaTh.randow();

class Math{
static double randow(){ //static Math로 직접 접근 중요하다

}
}

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StringTokenizer st=new StringTokenizer("this|is|a|test|" , "|")
boolean b=st.hasMoveTokens();

class StringTokenizer{
String str;
String str1;
StringTokenizer(String str, String str1)
boolean hasMoveTokens(){

}
}

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String s="abcd";
boolean b=s.startswith("ab")


class String{
boolean startswith(String s){
}
}

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