public abstract class BaseString {
 public abstract string text_test{get;}
 
}

public class ChineseString: BaseString {
 public override string text_test { get {return "哈嘍";}}
}

public class EnglishString : BaseString {
 public override string text_test { get {return "Hello";}}
}

public class TextManager {
 
 public BaseString strComponent;
 
 private ChineseString chineseStrCompenent = new ChineseString();
 private EnglishString englishStrComponent = new EnglishString();
 public TextManager() {
 strComponent = chineseStrCompenent;
 }
 
 public void ChangeLanguage(LanguageType type) {
 if (type == LanguageType.ZH)
 {
 strComponent = chineseStrCompenent;
 } else if (type == LanguageType.EN)
 {
 strComponent = englishStrComponent;
 }
 }
}

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;
 
public enum LanguageType
{
 ZH,
 EN
}
 
public class Global : MonoBehaviour {
 
 public Text textView;
 
 private LanguageType mLanguage = LanguageType.ZH;
 private TextManager textManager = new TextManager();
 // Use this for initialization
 void Start () {
 textManager.ChangeLanguage(mLanguage);
 }
 
 // Update is called once per frame
 void Update () {
 textView.text = textManager.strComponent.text_test;
 }
 
 public void SwitchLanguage()
 {
 if (mLanguage == LanguageType.ZH)
 {
 mLanguage = LanguageType.EN;
 } else if (mLanguage == LanguageType.EN)
 {
 mLanguage = LanguageType.ZH;
 }
 
 textManager.ChangeLanguage(mLanguage);
 }
}