Java 如何在没有任何重复/重复字符串的情况下随机化数组?
我可以随机化我在android中为每个按钮设置的字符串,但是有相同字母的重复。没有任何重复的字母我怎么做Java 如何在没有任何重复/重复字符串的情况下随机化数组?,java,android,arrays,random,Java,Android,Arrays,Random,我可以随机化我在android中为每个按钮设置的字符串,但是有相同字母的重复。没有任何重复的字母我怎么做 Random random = new Random(); String[] letters = {"G","O","K","U","H","A","N","L","Z","M"}; c1r1 = (Button) findViewById(R.id.btn1); c2r1 = (Button) findViewById(R.id.btn2); c3
Random random = new Random();
String[] letters = {"G","O","K","U","H","A","N","L","Z","M"};
c1r1 = (Button) findViewById(R.id.btn1);
c2r1 = (Button) findViewById(R.id.btn2);
c3r1 = (Button) findViewById(R.id.btn3);
c4r1 = (Button) findViewById(R.id.btn4);
c5r1 = (Button) findViewById(R.id.btn5);
c1r2 = (Button) findViewById(R.id.btn6);
c2r2 = (Button) findViewById(R.id.btn7);
c3r2 = (Button) findViewById(R.id.btn8);
c4r2 = (Button) findViewById(R.id.btn9);
c5r2 = (Button) findViewById(R.id.btn10);
first = (Button) findViewById(R.id.first);
second = (Button) findViewById(R.id.second);
third = (Button) findViewById(R.id.third);
fourth = (Button) findViewById(R.id.fourth);
c1r1.setText("" + letters[random.nextInt(letters.length)]);
c2r1.setText("" + letters[random.nextInt(letters.length)]);
c3r1.setText("" + letters[random.nextInt(letters.length)]);
c4r1.setText("" + letters[random.nextInt(letters.length)]);
c5r1.setText("" + letters[random.nextInt(letters.length)]);
c1r2.setText("" + letters[random.nextInt(letters.length)]);
c2r2.setText("" + letters[random.nextInt(letters.length)]);
c3r2.setText("" + letters[random.nextInt(letters.length)]);
c4r2.setText("" + letters[random.nextInt(letters.length)]);
c5r2.setText("" + letters[random.nextInt(letters.length)]);
private String[]字母={“G”、“O”、“K”、“U”、“H”、“A”、“N”、“L”、“Z”、“M”};
私有列表=新的ArrayList(Arrays.asList(字母));
私有字符串getUniqueRandomString(){
int i=ThreadLocalRandom.current().nextInt(0,letters.size()+1);
字符串s=字母。get(i);
删除第(i)款;
返回s;
}
私有void init(){
c1r1=(按钮)findViewById(R.id.btn1);
c2r1=(按钮)findViewById(R.id.btn2);
c3r1=(按钮)findViewById(R.id.btn3);
c4r1=(按钮)findViewById(R.id.btn4);
c5r1=(按钮)findViewById(R.id.btn5);
c1r2=(按钮)findViewById(R.id.btn6);
c2r2=(按钮)findViewById(R.id.btn7);
c3r2=(按钮)findViewById(R.id.btn8);
c4r2=(按钮)findViewById(R.id.btn9);
c5r2=(按钮)findViewById(R.id.btn10);
first=(按钮)findViewById(R.id.first);
秒=(按钮)findViewById(R.id.second);
第三个=(按钮)findViewById(R.id.third);
第四个=(按钮)findViewById(R.id.fourth);
c1r1.setText(getUniqueRandomString());
c2r1.setText(getUniqueRandomString());
// ...
}
私有字符串[]字母={“G”、“O”、“K”、“U”、“H”、“A”、“N”、“L”、“Z”、“M”};
私有列表=新的ArrayList(Arrays.asList(字母));
私有字符串getUniqueRandomString(){
int i=ThreadLocalRandom.current().nextInt(0,letters.size()+1);
字符串s=字母。get(i);
删除第(i)款;
返回s;
}
私有void init(){
c1r1=(按钮)findViewById(R.id.btn1);
c2r1=(按钮)findViewById(R.id.btn2);
c3r1=(按钮)findViewById(R.id.btn3);
c4r1=(按钮)findViewById(R.id.btn4);
c5r1=(按钮)findViewById(R.id.btn5);
c1r2=(按钮)findViewById(R.id.btn6);
c2r2=(按钮)findViewById(R.id.btn7);
c3r2=(按钮)findViewById(R.id.btn8);
c4r2=(按钮)findViewById(R.id.btn9);
c5r2=(按钮)findViewById(R.id.btn10);
first=(按钮)findViewById(R.id.first);
秒=(按钮)findViewById(R.id.second);
第三个=(按钮)findViewById(R.id.third);
第四个=(按钮)findViewById(R.id.fourth);
c1r1.setText(getUniqueRandomString());
c2r1.setText(getUniqueRandomString());
// ...
}
公共ArrayList ArrayList;
@凌驾
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
arrayList=新的arrayList();
字符串[]字母={“G”、“O”、“K”、“U”、“H”、“A”、“N”、“L”、“Z”、“M”};
for(字符串s:字母)
arrayList.add(s);
c1r1.setText(“+getRandom());
c2r1.setText(“+getRandom());
...
...
}
公共字符串getRandom(){
String randomString=arrayList.get(random.nextInt(arrayList.size());
arrayList.remove(随机字符串);
返回随机字符串;
}
公共ArrayList ArrayList;
@凌驾
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
arrayList=新的arrayList();
字符串[]字母={“G”、“O”、“K”、“U”、“H”、“A”、“N”、“L”、“Z”、“M”};
for(字符串s:字母)
arrayList.add(s);
c1r1.setText(“+getRandom());
c2r1.setText(“+getRandom());
...
...
}
公共字符串getRandom(){
String randomString=arrayList.get(random.nextInt(arrayList.size());
arrayList.remove(随机字符串);
返回随机字符串;
}
您可以使用
Collections.shuffle(列表)您只需使用
收藏。洗牌(列表)erm,等等。您使用了我的解决方案并将其清理干净了?:)谢谢@EmanuelSeibold和Abhishek Aryan。它非常有效:)呃,等等。您使用了我的解决方案并将其清理干净了?:)谢谢@EmanuelSeibold和Abhishek Aryan。它非常有效:)
private String[] letters = {"G","O","K","U","H","A","N","L","Z","M"};
private List<String> list = new ArrayList<String>(Arrays.asList(letters ));
private String getUniqueRandomString() {
int i = ThreadLocalRandom.current().nextInt(0, letters.size() + 1);
String s = letters.get(i);
letters.remove(i);
return s;
}
private void init() {
c1r1 = (Button) findViewById(R.id.btn1);
c2r1 = (Button) findViewById(R.id.btn2);
c3r1 = (Button) findViewById(R.id.btn3);
c4r1 = (Button) findViewById(R.id.btn4);
c5r1 = (Button) findViewById(R.id.btn5);
c1r2 = (Button) findViewById(R.id.btn6);
c2r2 = (Button) findViewById(R.id.btn7);
c3r2 = (Button) findViewById(R.id.btn8);
c4r2 = (Button) findViewById(R.id.btn9);
c5r2 = (Button) findViewById(R.id.btn10);
first = (Button) findViewById(R.id.first);
second = (Button) findViewById(R.id.second);
third = (Button) findViewById(R.id.third);
fourth = (Button) findViewById(R.id.fourth);
c1r1.setText(getUniqueRandomString());
c2r1.setText(getUniqueRandomString());
// ...
}
public ArrayList<String> arrayList;
@Override
protected void onCreate (Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
arrayList=new ArrayList<String>();
String[] letters = {"G","O","K","U","H","A","N","L","Z","M"};
for (String s:letters)
arrayList.add(s);
c1r1.setText("" + getRandom());
c2r1.setText("" + getRandom());
...
...
}
public String getRandom(){
String randomString=arrayList.get(random.nextInt(arrayList.size()));
arrayList.remove(randomString);
return randomString;
}