Advice?

package hangman;

import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

public class Hangman {
    private final ArrayList<String> gameStructure = new ArrayList<>(List.of(" _______", " |.....|", " |.....|", " |",
            " |",
            " |", "/-\\"));
    private final ArrayList<String> bodyParts = new ArrayList<>(List.of("O\n", "/", "|", "\\"));
    private String getHead(){
        return gameStructure.get(3).concat("....." + bodyParts.get(0));
    }
    private String getChest() {
        return gameStructure.get(4).trim();
    }
    private String getRightArm() {
        return bodyParts.get(3);
    }
    private String getLeftArm() {
        return gameStructure.get(4).concat("...." + bodyParts.get(1));
    }
    private String getRightLeg(){
        return bodyParts.get(3);
    }
    private String getLeftLeg(){
        return gameStructure.get(5).concat("...." + bodyParts.get(1));
    }
    Scanner input = new Scanner(System.in);
    private final String sentence = input.next();
    private final StringBuilder maskedSentence = new StringBuilder("-".repeat(sentence.length()));
    private final StringBuilder correctCharsEntered = new StringBuilder();
    private final StringBuilder incorrectCharsEntered = new StringBuilder();

    Hangman() {
        boardDisplay();
    }

    public void hangmanGame(){
        while (true) {
            if (correctCharsEntered.length() == sentence.length() + 2) break;
            System.out.println("Enter the word you want to experiment hangman on ");
            String human = input.next();
            if (maskedSentence.toString().equals(sentence)) {
                System.out.println("The word was entered correctly");
                boardDisplay();
                System.out.println(maskedSentence);
                break;
            } else if (human.equals(sentence)) {
                System.out.println(human);
                break;
            }
            while (human.length() != 1) {
                System.out.println("Enter one character");
                human = input.next();
            }
            correctCharsEntered.append(human);
            if (isCorrectCharacter(sentence, correctCharsEntered)) {
                incorrectCharsEntered.append(correctCharsEntered.charAt(correctCharsEntered.length() - 1));
                if (incorrectCharsEntered.length() == 1) {
                    System.out.println(" _______");
                    System.out.println(" |.....|");
                    System.out.println(" |.....|");
                    System.out.print(getHead());
                    System.out.println(" |");
                    System.out.println(" |");
                    System.out.println("/-\\");
                } else if (incorrectCharsEntered.length() == 2) {
                    System.out.println(" _______");
                    System.out.println(" |.....|");
                    System.out.println(" |.....|");
                    System.out.print(getHead());
                    System.out.println(getLeftArm());
                    System.out.println(" |");
                    System.out.println("/-\\");
                } else if (incorrectCharsEntered.length() == 3) {
                    System.out.println(" _______");
                    System.out.println(" |.....|");
                    System.out.println(" |.....|");
                    System.out.print(getHead());
                    System.out.println(getLeftArm() + getChest());
                    System.out.println(" |");
                    System.out.println("/-\\");
                } else if (incorrectCharsEntered.length() == 4) {
                    System.out.println(" _______");
                    System.out.println(" |.....|");
                    System.out.println(" |.....|");
                    System.out.print(getHead());
                    System.out.println(getLeftArm() + getChest() + getRightArm());
                    System.out.println(" |");
                    System.out.println("/-\\");
                } else if (incorrectCharsEntered.length() == 5) {
                    System.out.println(" _______");
                    System.out.println(" |.....|");
                    System.out.println(" |.....|");
                    System.out.print(getHead());
                    System.out.println(getLeftArm() + getChest() + getRightArm());
                    System.out.println(getLeftLeg());
                    System.out.println("/-\\");
                } else if (incorrectCharsEntered.length() == 6) {
                    System.out.println(" _______");
                    System.out.println(" |.....|");
                    System.out.println(" |.....|");
                    System.out.print(getHead());
                    System.out.println(getLeftArm() + getChest() + getRightArm());
                    System.out.println(getLeftLeg()+ getRightLeg());
                    System.out.println("/-\\");
                    System.out.println();
                    System.out.println("GAME OVER");
                    break;
                }
                System.out.println(maskedSentence);
                correctCharsEntered.deleteCharAt(correctCharsEntered.length() - 1);

            } else {
                for (int i = 0; i < sentence.length(); i++) {
                    unMaskSentence(sentence, i);
                }
            }
        }
    }

    private void unMaskSentence(String sentence, int i) {
        if (sentence.charAt(i) == correctCharsEntered.charAt(correctCharsEntered.length() - 1)) {
            maskedSentence.setCharAt(i, correctCharsEntered.charAt(correctCharsEntered.length() - 1));
        }
    }

    private boolean isCorrectCharacter(String sentence, StringBuilder correctCharsEntered) {
        return !sentence.contains(correctCharsEntered);
    }

    private void boardDisplay() {
        for (String s : gameStructure) {
            System.out.println(s);
        }
    }
}