Question

当我在我的Android设备上运行下面的代码时，我得到一个ArrayOutOfBounds异常，说y = 6.但是，这在理论上是不可能的，因为for循环的边界是y＆lt; 6.我搜索了可能的解释，但没有找到。 matrix1Numbers的大小为6乘6，每个维度保持0-5。

for (z = 0; z < 6; ++z) {
        for (y = 0; y < 6; ++y) {
            matrix1Numbers[z][y].addTextChangedListener(new TextWatcher() {
                @Override
                public void beforeTextChanged(  CharSequence s, int start, int count, int after) {

                }

                @Override
                public void onTextChanged(CharSequence s, int start, int before, int count) {
                    if (matrix1Numbers[z][y].getText().toString().equals("")) {
                        for (int a = 0; a < z; ++a) {
                            for (int b = y; b < 6; ++b) {
                                matrix1Numbers[a][b].setText("");
                                matrix1Numbers[a][b].setBackgroundColor(Color.WHITE);
                            }
                        }

                        for (int a = z; a < 6; ++a) {
                            for (int b = 0; b < y; ++b) {
                                matrix1Numbers[a][b].setText("");
                                matrix1Numbers[a][b].setBackgroundColor(Color.WHITE);
                            }
                        }

                        for (int a = z; a < 6; ++a) {
                            for (int b = y; b < 6; ++b) {
                                matrix1Numbers[a][b].setText("");
                                matrix1Numbers[a][b].setBackgroundColor(Color.WHITE);
                            }
                        }
                    } else {
                        if (z > matrix1MaxX) {
                            matrix1MaxX = z;
                        }
                        if (y > matrix1MaxY) {
                            matrix1MaxY = y;
                        }

                        for (int a = 0; a < matrix1MaxX; ++a) {
                            for (int b = 0; b < matrix1MaxY; ++b) {
                                matrix1Numbers[a][b].setBackgroundColor(Color.BLUE);
                            }
                        }
                    }
                }

                @Override
                public void afterTextChanged(Editable s) {

                }
            });


            matrix2Numbers[z][y].addTextChangedListener(new TextWatcher() {
                @Override
                public void beforeTextChanged(CharSequence s, int start, int count, int after) {

                }

                @Override
                public void onTextChanged(CharSequence s, int start, int before, int count) {
                    if (matrix2Numbers[z][y].getText().toString().equals("")) {
                        for (int a = 0; a < z; ++a) {
                            for (int b = y; b < 6; ++b) {
                                matrix2Numbers[a][b].setText("");
                                matrix2Numbers[a][b].setBackgroundColor(Color.WHITE);
                            }
                        }

                        for (int a = z; a < 6; ++a) {
                            for (int b = 0; b < y; ++b) {
                                matrix2Numbers[a][b].setText("");
                                matrix2Numbers[a][b].setBackgroundColor(Color.WHITE);
                            }
                        }

                        for (int a = z; a < 6; ++a) {
                            for (int b = y; b < 6; ++b) {
                                matrix2Numbers[a][b].setText("");
                                matrix2Numbers[a][b].setBackgroundColor(Color.WHITE);
                            }
                        }
                    } else {
                        if (z > matrix2MaxX) {
                            matrix2MaxX = z;
                        }
                        if (y > matrix2MaxY) {
                            matrix2MaxY = y;
                        }

                        for (int a = 0; a < matrix2MaxX; ++a) {
                            for (int b = 0; b < matrix2MaxY; ++b) {
                                matrix2Numbers[a][b].setBackgroundColor(Color.BLUE);
                            }
                        }
                    }
                }

                @Override
                public void afterTextChanged(Editable s) {

                }
            });



        }

Answer 1

检查代码的其他部分代码是否适用于您的y和z，因为您在循环之外声明它们。可能有一些代码可以修改它们，而你却不知道副作用。

Java Android Studio For循环超出其限制

1 个答案: