我正在尝试制作一个程序来制作2个随机数组,然后使用气泡方法对它们进行排序,以便稍后我可以轻松找出3个中间数字。当我第一次延迟eclipse并运行它时,但每当我再次尝试运行时,控制台都没有显示任何内容,我认为程序仍在运行,因为我可以选择终止它。
import java.util.Arrays;
import java.util.Random;
public class DiversCalc {
public static void main(String[] args){
int[] Diver1 = new int[7];
int[] Diver2 = new int[7];
Random rand = new Random();
for (int positionInArray = 0; positionInArray < Diver1.length;
positionInArray++) {
int diverScore1 = rand.nextInt(10);
Diver1[positionInArray] = diverScore1;
}
for (int positionInArray2 = 0; positionInArray2 < Diver2.length;
positionInArray2++) {
int diverScore1 = rand.nextInt(10);
Diver2[positionInArray2] = diverScore1;
}
int temp = 0;
boolean checker = false;
boolean checker2 = false;
while(checker==false){
checker=true;
for(int positionCheck1 = 0; positionCheck1 < Diver1.length-1;
positionCheck1++){
if(Diver1[positionCheck1] > Diver1[positionCheck1+1]){
temp = Diver1[positionCheck1+1];
Diver1[positionCheck1+1] = Diver1[positionCheck1];
Diver1[1] = temp;
checker=false;
}
}
}
while(checker2==false){
checker2=true;
for(int positionCheck2 = 0; positionCheck2 < Diver2.length-1;
positionCheck2++){
if(Diver2[positionCheck2] > Diver2[positionCheck2+1]){
temp = Diver2[positionCheck2+1];
Diver2[positionCheck2+1] = Diver2[positionCheck2];
Diver2[1] = temp;
checker2=false;
}
}
}
System.out.println(Arrays.toString(Diver1));
System.out.println(Arrays.toString(Diver2));
}
}
答案 0 :(得分:1)
你的意思是总是将Diver1的第二个位置设置为临时变量吗?
因为这就是你所说的try {
// register driver
Class.forName("org.h2.Driver");
// open connection, in-memory database
Connection conn = DriverManager.getConnection("jdbc:h2:mem:");
conn.setAutoCommit(false);
// create table
PreparedStatement createSample = conn.prepareStatement("CREATE TABLE sample (id int not null auto_increment, txt varchar(128))");
createSample.executeUpdate();
createSample.close();
// prepare insert statement
PreparedStatement insertStatement = conn.prepareStatement("INSERT INTO sample (txt) VALUES (?)", Statement.RETURN_GENERATED_KEYS);
// dummy list with texts
List<String> dummyTexts = Arrays.asList("Entry A", "Entry B", "Entry C", "Entry D", "Entry E");
// insert data
for (String dummyText : dummyTexts) {
insertStatement.setString(1, dummyText);
insertStatement.executeUpdate();
// get generated key
ResultSet generatedKeys = insertStatement.getGeneratedKeys();
if ((generatedKeys != null) && (generatedKeys.next())) {
int generatedKey = generatedKeys.getInt(1);
System.out.println("generated key " + generatedKey + " for entry '" + dummyText + "'");
}
}
// commit
conn.commit();
insertStatement.close();
// select data
PreparedStatement selection = conn.prepareStatement("SELECT id, txt FROM sample");
ResultSet selectionResult = selection.executeQuery();
while (selectionResult.next()) {
System.out.println("id: " + selectionResult.getInt(1) + ", txt: '" + selectionResult.getString(2) + "'");
}
selectionResult.close();
selection.close();
// close connection
conn.close();
} catch (Exception ex) {
ex.printStackTrace();
}
。也许试着说Diver1[1] = temp
之类的东西。这适用于您尝试排序的两个点。
另外,我不相信你的冒泡排序是一个完整的冒泡排序。它似乎只对数字数组进行一次迭代,将最大值冒泡到数组的末尾然后停止。完整的冒泡排序将继续这些迭代,将max元素一直移动到最后,然后将第二个max元素从末尾移动到第二个点,然后将第三个max元素从末尾移动到第三个点,等等。直到排序。
更新:
您的代码永远不会到达打印语句,因为它会卡在您的Diver1[positionCheck2] = temp
循环中。 while
仍然是假的,所以它从不存在循环。正如我上面提到的,修复你的“交换”,最终应该解决。