java iterate over a string
String scientistName = "Isaac Newton";
for (int i = 0; i < scientistName.length(); i++) {
System.out.print(scientistName.charAt(i) + " "); // I s a a c N e w t o n
}
//*********************************************************
// you can cast a string into a char[]
String str = "strings are not primitive types!";
for (char ch : str.toCharArray()) {
System.out.print(scientistName.charAt(i) + " ");
}
}loop and save letters in a string java
public static void main(String[] args){
Scanner input = new Scanner(System.in);
System.out.print("Enter phone number: ");
String number = input.nextLine();
String phone ="";
for (int i = 0; i < number.length(); i++){
if (Character.isLetter(number.charAt(i)))
phone = getNumber(Character.toUpperCase(number.charAt(i)));
else
number.charAt(i);
}
System.out.println("Your number is " + phone);
}
public static int getNumber(char uppercaseLetter){
if (uppercaseLetter >= 'W' && uppercaseLetter <= 'Z')
return 9;
else if (uppercaseLetter >= 'T' && uppercaseLetter < 'W')
return 8;
else if (uppercaseLetter >= 'P' && uppercaseLetter < 'T')
return 7;
else if (uppercaseLetter >= 'M' && uppercaseLetter < 'P')
return 6;
else if (uppercaseLetter >= 'J' && uppercaseLetter < 'M')
return 5;
else if (uppercaseLetter >= 'G' && uppercaseLetter < 'J')
return 4;
else if (uppercaseLetter >= 'D' && uppercaseLetter < 'G')
return 3;
else
return 2;
}
}Copyright © 2021 Codeinu
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