有没有一种方法可以用唯一的非随机值填充2D数组？编译器将不允许类似以下内容：
int[][] myArray=new int[5][5];
myArray[0]=new int[] {2, 1, 1, 1, 1};
确实发生了，我在此看到的所有教程都与添加随机数或从一开始就填充数组有关（不适用于我，因为我的程序取决于用户输入才能知道要添加的数字值） ）。如果这不可能，那我应该使用另一种方法吗？
答案 0 :(得分：0)
您应该使用嵌套的for循环：
for(i=0;i<arr.lenght;i++)
for(j=0;j<arr.lenght;j++)
执行嵌套循环后，添加以下内容： myArray [i] [j] = userInput.next（）; //假设您正在使用Scanner类
嵌套循环的作用是遍历数组具有的每个“空格”，并且由于您每次都要求用户输入某些内容，因此数组将在每个“空格”中填充所需的输入。
希望这会有所帮助。（忽略我的编辑，完全误读）
答案 1 :(得分：0)
您可以在整个2D整数（int）数组中填充整个数组中的唯一值，或者仅在数组的每一行中使用唯一值。有几种方法可以执行此类操作，但我们只会坚持使用基本方法。该代码是很好的注释：
用户仅使用唯一行填充2D整数数组：
// Setup for Keyboard input to Console.
Scanner input = new Scanner(System.in);
// System Line Separator used in console display.
String ls = System.lineSeparator();
// Declare and initialize a 2D Object Array.
// We need to use Object so that all initialized
// elements will be null rather than 0 since 0
// could be supplied and will need to be checked
// for Unique. Since a 2D int array by default
// initializes all elements to 0, a supplied 0
// will never be considered Unique.
Object[][] myArray = new Object[5][5];
// Have User fill our 2D Array...
for (int row = 0; row < myArray.length; row++) {
// Display the Row User will be on to fill.
System.out.println(ls + "Enter values for Row #" + (row+1) +
" of " + myArray.length);
// Allow User to fill each column of the current Row...
for (int column = 0; column < myArray[row].length; column++) {
// Flag to indicate Uniqueness.
boolean unique = false;
// Integer variable to hold what the User enters in console
int value = 0;
// Continue looping to ensure the User supplied a proper
// integer value which is unique to the current 2D Array
// Row only.
while (!unique) {
// Display the Column User will be on to fill.
System.out.print("Column #" + (column+1) + " value: --> ");
// Trap User entries that are not Integer values. If any alpha
// characters are supplied with the value then an exception is
// automatically thrown which we trap.
try {
// Get input from User...
value = input.nextInt();
} catch (Exception ex) {
// Inform the User of an improper entry if an exception was thrown.
System.err.println("You must supply an Integer value. Try again...");
input.nextLine(); // Clear Scanner buffer
// Allow User to try another entry for the same Column
continue;
}
// See if the supplied value is already contained within the
// current array Row...
for (int j = 0; j < myArray[row].length; j++) {
// Stop checking if we hit null. Nothing there yet.
if (myArray[row][j] == null) {
unique = true;
break;
}
// If a row's column element equals supplied value...
else if ((int)myArray[row][j] == value) {
// Value is not Unique
unique = false;
System.err.println("Value is not unique to Row #" +
(row+1) + " - Try Again...");
break; // Break out of checking early
}
// The supplied value is unique.
else {
unique = true;
}
}
}
//Place the value into the current
// Column for the current Row
myArray[row][column] = value;
}
}
// Convert the 2D Object Array to a 2D int Array
int[][] intArray = new int[myArray.length][myArray[0].length];
for (int i = 0;i < myArray.length; i++) {
for (int j = 0; j < myArray[i].length; j++) {
intArray[i][j] = (int)myArray[i][j]; // Cast to int
}
}
// Display the 2D Array in Console Window...
System.out.println(ls + "2D Integer Array Contents:");
for (int i = 0; i < intArray.length; i++) {
System.out.println("Row #" + (i+1) + ": " + Arrays.toString(intArray[i]));
}
}
用户在整个数组中使用唯一值填充2D整数数组：
// Setup for Keyboard input to Console.
Scanner input = new Scanner(System.in);
// System Line Separator used in console display.
String ls = System.lineSeparator();
// Declare and initialize a 2D Object Array.
// We need to use Object so that all initialized
// elements will be null rather than 0 since 0
// could be supplied and will need to be checked
// for Unique. Since a 2D int array by default
// initializes all elements to 0, a supplied 0
// will never be considered Unique.
Object[][] myArray = new Object[5][5];
// Have User fill our 2D Array...
for (int row = 0; row < myArray.length; row++) {
// Display the Row User will be on to fill.
System.out.println(ls + "Enter values for Row #" + (row+1) +
" of " + myArray.length);
// Allow User to fill each column of the current Row...
for (int column = 0; column < myArray[row].length; column++) {
// Flag to indicate Uniqueness.
boolean unique = false;
// Integer variable to hold what the User enters in console
int value = 0;
// Continue looping to ensure the User supplied a proper
// integer value which is unique to the ENTIRE 2D Array.
while (!unique) {
// Display the Column User will be on to fill.
System.out.print("Column #" + (column+1) + " value: --> ");
// Trap User entries that are not Integer values. If any alpha
// characters are supplied with the value then an exception is
// automatically thrown which we trap.
try {
// Get input from User...
value = input.nextInt();
} catch (Exception ex) {
// Inform the User of an improper entry if an exception was thrown.
System.err.println("You must supply an Integer value. Try again...");
input.nextLine(); // Clear Scanner buffer
// Allow User to try another entry for the same Column
continue;
}
// Flag to hold when a match is found. This flag will allow
// us to break out the the for loops faster
boolean match = false;
// See if value is already contained within the array.
// Iterate Rows...
for (int i = 0; i < myArray.length; i++) {
// Iterate the Columns for each Row...
for (int j = 0; j < myArray[i].length; j++) {
// Stop checking if we hit null. Nothing there yet.
if (myArray[i][j] == null) {
break;
}
// If a row's column element equals supplied value...
else if ((int)myArray[i][j] == value) {
match = true; // A match was detected - Not Unique
System.err.println("Value is not Unique - Try Again...");
break; // Break out of checking early
}
}
if (match) { break; } // Break out of outer loop is there was a match
}
unique = !match; // unique flag is to be oposite of what match contains
}
myArray[row][column] = value; // Add supplied value to array
}
}
// Convert the 2D Object Array to a 2D int Array
int[][] intArray = new int[myArray.length][myArray[0].length];
for (int i = 0;i < myArray.length; i++) {
for (int j = 0; j < myArray[i].length; j++) {
intArray[i][j] = (int)myArray[i][j]; // Cast to int
}
}
// Display the 2D Array...
System.out.println(ls + "2D Integer Array Contents:");
for (int i = 0; i < intArray.length; i++) {
System.out.println("Row #" + (i+1) + ": " + Arrays.toString(intArray[i]));
}