Java优学网for循环讲解：从基础到实战，轻松掌握循环编程技巧

for (初始化表达式; 布尔表达式; 更新表达式) {

// 循环体

}

for (int i = 0; i < 3; i++) {

for (int j = 0; j < 3; j++) {
    System.out.println("i=" + i + ", j=" + j);
}

}

int[] numbers = {1, 2, 3}; for (int i = 0; i <= numbers.length; i++) {

System.out.println(numbers[i]); // 当i=3时抛出异常

}

// 传统for循环 for (int i = 0; i < array.length; i++) {

System.out.println(array[i]);

}

// foreach循环 for (int number : array) {

System.out.println(number);

}