Java 随机元素的输出不应重复
我制作了一个测验应用程序,在那里我有一个包含问题、选项和正确答案的数组列表。我已经设定了问题将随机化。但随机化的问题会自己重复一次或多次。我如何设置每个问题只发生一次?在问题库中是数组列表,在测验活动中是随机化器和其他东西。代码:Java 随机元素的输出不应重复,java,android,arrays,collections,Java,Android,Arrays,Collections,我制作了一个测验应用程序,在那里我有一个包含问题、选项和正确答案的数组列表。我已经设定了问题将随机化。但随机化的问题会自己重复一次或多次。我如何设置每个问题只发生一次?在问题库中是数组列表,在测验活动中是随机化器和其他东西。代码: package amapps.impossiblequiz; import java.util.ArrayList; import java.util.Collections; import java.util.List;
package amapps.impossiblequiz;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
public class QuestionLibrary {
private final String[] [] mChoices ={
{"1993", "1986", "1967"},
{"-260", "-272,15", "279,15"},
{"a plant","The active substance of marijuana" , "a spider"},
{"6", "10","8"},
{"12","15","10"},
{"Uranus","Neptune","Saturn"},
{"HCl","NaCl","CO"},
{"John F. Kennedy", "Richard Nixon","James A. Garfield"},
{"Canada","Denmark", "Greenland is an own state?"},
{"12","20","14"},
{"10","12","14"},
{"not","never","now"},
{"Leningrad","Wolgograd","Dimitrijgrad"}
};
private final String mQuestions[] = {
"When was the European Union founded?",
"How many Grad Celsius is one Kelvin?",
"What is THC?",
"How many legs has a spider?",
"How many stars has the European flag?",
"Which is the seventh planet from the sun?",
"What is the chemical formula of salt?",
"Who said: Ich bin ein berliner?",
"To which country belongs Greenland?",
"What is the result of: 2 + 2 *5?",
"How many mountains are higher than 8000 meter/26.246 ft?",
"A famous quote is: to be, or____ to be!",
"What is the name of Stalingrad nowadays?"
};
private final String mCorrectAnswers[] = {
"1993", "-272,15", "The active substance of marijuana",
"8", "12","Uranus","NaCl","John F. Kennedy",
"Denmark","12","14","not","Wolgograd"
};
private final List<Integer> indexes = new ArrayList<>();
public QuestionLibrary() {
for (int i = 0; i < mQuestions.length; ++i)
indexes.add(i);
}
private int index(int i) {
return indexes.get(i);
}
public String getQuestion(int a) {
return mQuestions[index(a)];
}
public String getChoice1(int a) {
return mChoices[index(a)][0];
}
public String getChoice2(int a) {
return mChoices[index(a)][1];
}
public String getChoice3(int a) {
return mChoices[index(a)][2];
}
public String getCorrectAnswer(int a) {
return mCorrectAnswers[index(a)];
}
public int getlength() {
return mQuestions.length;
}
public void shuffle() {
Collections.shuffle(indexes);
}
}
package amapps.impossiblequiz;
import android.content.Intent;
import android.os.Bundle;
import android.support.design.widget.NavigationView;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.ActionBarDrawerToggle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
public class QuizActivity extends AppCompatActivity {
private DrawerLayout mDrawerLayout;
private ActionBarDrawerToggle mToggle;
private Toolbar mToolbar;
private MenuItem menuItem;
private Intent in;
private QuestionLibrary mQuestionLibrary = new QuestionLibrary();
private TextView mScoreView;
private TextView mQuestionView;
private Button mButtonChoice1;
private Button mButtonChoice2;
private Button mButtonChoice3;
private String mAnswer;
private int mScore = 0;
private int mQuestionNumber = 0;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_quiz);
QuestionLibrary q = new QuestionLibrary();
System.out.printf("Question:0 Choice:(%s, %s, %s) Answer:%s%n",
q.getChoice1(0), q.getChoice2(0), q.getChoice3(0), q.getCorrectAnswer(0));
q.shuffle();
System.out.printf("Question:0 Choice:(%s, %s, %s) Answer:%s%n",
q.getChoice1(0), q.getChoice2(0), q.getChoice3(0), q.getCorrectAnswer(0));
mToolbar = (Toolbar) findViewById(R.id.nav_action);
setSupportActionBar(mToolbar);
mDrawerLayout = (DrawerLayout) findViewById(R.id.drawerLayout);
mToggle = new ActionBarDrawerToggle(this, mDrawerLayout, R.string.open, R.string.close);
mDrawerLayout.addDrawerListener(mToggle);
mToggle.syncState();
getSupportActionBar().setDisplayHomeAsUpEnabled(true); //Able to see the Navigation Burger "Button"
NavigationView mNavigationView = (NavigationView) findViewById(R.id.nv1);
mNavigationView.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener(){
@Override
public boolean onNavigationItemSelected(MenuItem menuItem){
switch (menuItem.getItemId()){
case(R.id.nav_stats):
Intent accountActivity = new Intent(getApplicationContext(),Menu2.class);
startActivity(accountActivity);
}
return true;
}
});
mScoreView = (TextView) findViewById(R.id.score);
mQuestionView = (TextView) findViewById(R.id.question);
mButtonChoice1 = (Button) findViewById(R.id.choice1);
mButtonChoice2 = (Button) findViewById(R.id.choice2);
mButtonChoice3 = (Button) findViewById(R.id.choice3);
updateQuestion();
//Start of Button Listener1
mButtonChoice1.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
//My logic for Button goes in here
if (mButtonChoice1.getText() == mAnswer) {
mScore = mScore + 1;
updateScore(mScore);
updateQuestion();
mQuestionLibrary.shuffle();
//This line of code is optional...
Toast.makeText(QuizActivity.this, "Correct", Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(QuizActivity.this, "Wrong... Try again!", Toast.LENGTH_SHORT).show();
mScore = 0;
updateScore(mScore);
updateQuestion();
mQuestionLibrary.shuffle();
}
}
});
//End of Button Listener1
//Start of Button Listener2
mButtonChoice2.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
//My logic for Button goes in here
if (mButtonChoice2.getText() == mAnswer) {
mScore = mScore + 1;
updateScore(mScore);
updateQuestion();
mQuestionLibrary.shuffle();
//This line of code is optional...
Toast.makeText(QuizActivity.this, "Correct", Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(QuizActivity.this, "Oh... wrong your score is 0", Toast.LENGTH_SHORT).show();
mScore = 0;
updateScore(mScore);
updateQuestion();
mQuestionLibrary.shuffle();
}
}
});
//End of Button Listener2
//Start of Button Listener3
mButtonChoice3.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
//My logic for Button goes in here
if (mButtonChoice3.getText() == mAnswer) {
mScore = mScore + 1;
updateScore(mScore);
updateQuestion();
mQuestionLibrary.shuffle();
//This line of code is optional...
Toast.makeText(QuizActivity.this, "Correct", Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(QuizActivity.this, "Come on, that was not so hard...", Toast.LENGTH_SHORT).show();
mScore = 0;
updateScore(mScore);
updateQuestion();
mQuestionLibrary.shuffle();
}
}
});
//End of Button Listener3
}
private void updateQuestion() {
if (mQuestionNumber < mQuestionLibrary.getlength()) {
mQuestionView.setText(mQuestionLibrary.getQuestion(mQuestionNumber));
mButtonChoice1.setText(mQuestionLibrary.getChoice1(mQuestionNumber));
mButtonChoice2.setText(mQuestionLibrary.getChoice2(mQuestionNumber));
mButtonChoice3.setText(mQuestionLibrary.getChoice3(mQuestionNumber));
mAnswer = mQuestionLibrary.getCorrectAnswer(mQuestionNumber);
mQuestionNumber++;
} else Toast.makeText(QuizActivity.this, "Last Question!", Toast.LENGTH_SHORT).show();
}
private void updateScore(int point) {
mScoreView.setText("" + mScore);
}
@Override //Makes that the "Burger" Item, shows the Drawer if someone clicks on the simbol
public boolean onOptionsItemSelected(MenuItem item) {
if (mToggle.onOptionsItemSelected(item)) {
return true;
}
return super.onOptionsItemSelected(item);
}
}
包amapps.impossiblequick;
导入java.util.ArrayList;
导入java.util.Collections;
导入java.util.List;
公共图书馆{
私有最终字符串[][]mChoices={
{"1993", "1986", "1967"},
{"-260", "-272,15", "279,15"},
{“植物”、“大麻的活性物质”、“蜘蛛”},
{"6", "10","8"},
{"12","15","10"},
{“天王星”、“海王星”、“土星”},
{“HCl”、“NaCl”、“CO”},
{“约翰·F·肯尼迪”、“理查德·尼克松”、“詹姆斯·A·加菲尔德”},
{“加拿大”、“丹麦”、“格陵兰是自己的州?”},
{"12","20","14"},
{"10","12","14"},
{“不”、“永远”、“现在”},
{“列宁格勒”、“沃尔加格勒”、“迪米特里贾格勒”}
};
专用最终字符串mQuestions[]={
“欧盟是什么时候成立的?”,
“一开尔文等于多少摄氏度?”,
“什么是THC?”,
“蜘蛛有几条腿?”,
“欧洲国旗有几颗星?”,
“离太阳第七颗行星是哪颗?”,
“盐的化学式是什么?”,
“谁说:我是柏林人?”,
“格陵兰属于哪个国家?”,
“2+2*5的结果是什么?”,
“有多少座山高于8000米/26.246英尺?”,
“一句著名的格言是:未来,或未来!”,
“现在斯大林格勒叫什么名字?”
};
私有最终字符串mCorrectAnswers[]={
“1993”、“-272,15”、“大麻的活性物质”,
“8”、“12”、“天王星”、“NaCl”、“约翰·F·肯尼迪”,
“丹麦”、“12”、“14”、“非”、“沃尔加格勒”
};
私有最终列表索引=新的ArrayList();
公共图书馆(){
for(int i=0;ipublic class Question {
//public fields (aka variables) are accessed using "questionObject.field"
public String question;
public String[] choices;
public String answer;
public Question(String question, String[] choices, String answer){
this.question = question;
//TODO: the same for choices and answer
}
public boolean isCorrect(String userInput){
//TODO: method that checks if answer is correct
}
}