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</ScrollView>

[Rent_Password,java]

package kr.icehs.intec.mdp;

import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;

public class Rent_Password extends AppCompatActivity {

public static final String TAG = "Rent_PasswordActivity";

EditText codeField1000;
EditText codeField100;
EditText codeField10;
EditText codeField1;

String RANDOM;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_rent__password);
Intent intent200 = getIntent();
RANDOM = intent200.getExtras().getString("random");
Toast.makeText(Rent_Password.this, RANDOM, Toast.LENGTH_SHORT).show();

codeField1000 = (EditText) findViewById(R.id.passcode_1000);
codeField100 = (EditText) findViewById(R.id.passcode_100);
codeField10 = (EditText) findViewById(R.id.passcode_10);
codeField1 = (EditText) findViewById(R.id.passcode_1);
}

public void onClick_Rent_password_ok(View view) {

String random1000 = RANDOM.substring(0,1);
String random100 = RANDOM.substring(1,2);
String random10 = RANDOM.substring(2,3);
String random1 = RANDOM.substring(3,4);

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