Java中数组的一些常见操作和技巧分析

dataType[] arrayName = new dataType[arrayLength];

int[] numbers = new int[5];

dataType[] arrayName = {value1, value2, value3, ...};

String[] names = {"Alice", "Bob", "Charlie"};

dataType[] arrayName = new dataType[arrayLength];
arrayName[index] = value;

float[] grades = new float[3];
grades[0] = 90.5f;
grades[1] = 85.0f;
grades[2] = 92.3f;

dataType[] arrayName = new dataType[arrayLength];
for (int i = 0; i < arrayName.length; i++) {
    arrayName[i] = value;
}

int[] numbers = new int[5];
for (int i = 0; i < numbers.length; i++) {
    numbers[i] = i + 1;
}

dataType element = arrayName[index];

int firstElement = numbers[0];

arrayName[index] = newValue;

numbers[2] = 100;

int length = arrayName.length;

int arrayLength = numbers.length;

for (int i = 0; i < arrayName.length; i++) {
    // 执行操作
}

for (int i = 0; i < numbers.length; i++) {
    System.out.println(numbers[i]);
}

Arrays.sort(arrayName);

Arrays.sort(numbers);

dataType[] newArray = Arrays.copyOf(arrayName, length);

int[] newArray = Arrays.copyOf(numbers, numbers.length);