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请教了一下大神舍友

开始从B站上学spring-boot，加油

学习内容虽然还是安卓

package com.dongnaoedu.chapter06;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;

import android.view.View;

import android.widget.CheckBox;

import android.widget.EditText;

public class AppWriteActivity extends AppCompatActivity implements View.OnClickListener {

    private EditText et_name;

    private EditText et_age;

    private EditText et_height;

    private EditText et_weight;

    private CheckBox ck_married;

    private MyApplication app;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_app_write);

        et_name = findViewById(R.id.et_name);

        et_age = findViewById(R.id.et_age);

        et_height = findViewById(R.id.et_height);

        et_weight = findViewById(R.id.et_weight);

        ck_married = findViewById(R.id.ck_married);

        findViewById(R.id.btn_save).setOnClickListener(this);

        app = MyApplication.getInstance();

        reload();

    }

    private void reload() {

        String name = app.infoMap.get("name");

        if (name == null) {

            return;

        }

        String age = app.infoMap.get("age");

        String height = app.infoMap.get("height");

        String weight = app.infoMap.get("weight");

        String married = app.infoMap.get("married");

        et_name.setText(name);

        et_age.setText(age);

        et_height.setText(height);

        et_weight.setText(weight);

        if ("是".equals(married)) {

            ck_married.setChecked(true);

        } else {

            ck_married.setChecked(false);

        }

    }

    @Override

    public void onClick(View v) {

        String name = et_name.getText().toString();

        String age = et_age.getText().toString();

        String height = et_height.getText().toString();

        String weight = et_weight.getText().toString();

        app.infoMap.put("name", name);

        app.infoMap.put("age", age);

        app.infoMap.put("height", height);

        app.infoMap.put("weight", weight);

        app.infoMap.put("married", ck_married.isChecked() ? "是" : "否");

    }

}