1、判断语句练习题:https://blog.csdn.net/m0_55586329/article/details/122441587
2、循环语句练习题:https://blog.csdn.net/m0_55586329/article/details/122451061
3、判断语句理论知识:https://blog.csdn.net/m0_55586329/article/details/116331989
4、数组理论实践知识(强烈推荐观看):https://blog.csdn.net/m0_55586329/article/details/116840485
public class Demo01 { public static void main(String[] args) { int[] arrays = {1, 3, 6, 7, 2, 5, 9, 0}; // 方法一:遍历数组的方式 // 先定义最大值为第一位先,然后进行比较 int max = arrays[0]; int min = arrays[0]; for (int i = 0; i < arrays.length; i++) { if (max < arrays[i]) { max = arrays[i]; } if (min > arrays[i]) { min = arrays[i]; } } System.out.println("最大值Max=" + max + " 最小值Min=" + min); // 方法二:使用封装好的方法 System.out.println("Max=" + Arrays.stream(arrays).max().getAsInt() + " Min=" + Arrays.stream(arrays).min().getAsInt()); } }
public class Demo02 { public static void main(String[] args) { int[] arrays = {1, 3, 6, 7, 2, 5, 9, 0}; // 方法一:选择排序 for (int i = 0; i < arrays.length; i++) { for (int j = i + 1; j < arrays.length; j++) { if (arrays[i] >= arrays[j]) { int temp = arrays[i]; arrays[i] = arrays[j]; arrays[j] = temp; } } } System.out.println("方法一: " + Arrays.toString(arrays)); // 方法二:简单的一行代码 【注】:会改变数组的,慎用 Arrays.sort(arrays); System.out.println(Arrays.toString(arrays)); } }
public class Demo03 { public static void main(String[] args) { int[] arrays = {1, 2, 3, 4, 5, 6, 7, 8, 9, 0}; Scanner scanner = new Scanner(System.in); int input = scanner.nextInt(); for (int i = 0; i < arrays.length; i++) { if (arrays[i] == input) { System.out.println("true"); } } } }
public class Demo04 { public static void main(String[] args) { int[][] arrays = new int[][]{{1, 2, 3}, {3, 2, 1}, {0, 0, 0}}; for (int i = 0; i < arrays.length; i++) { for (int j = 0; j < arrays[i].length; j++) { System.out.print(arrays[i][j] + " "); } } } }
public class Demo05 { public static void main(String[] args) { Scanner scanner = new Scanner(System.in); int[] arrays = new int[10]; int sum = 0; for (int i = 1; i <= arrays.length; i++) { System.out.print("请输入第" + i + "个整数:"); arrays[i - 1] = scanner.nextInt(); sum += arrays[i - 1]; } System.out.println("元素的和:" + sum + " 平均值:" + sum / arrays.length); } }
public class Demo06 { public static void main(String[] args) { String[] arrays = new String[]{null, null, "记忆头盔", "裁决之杖", null, "", "普通草鞋"}; Scanner scanner = new Scanner(System.in); for (int i = 0; i < arrays.length; i++) { if (arrays[i] == null) { System.out.print("请武装好装备:"); arrays[i] = scanner.next(); } } System.out.println(Arrays.toString(arrays)); } }
public class Demo07 { public static void main(String[] args) { Random random = new Random(); int[] arrays = new int[15]; for (int i = 0; i < arrays.length; i++) { arrays[i] = random.nextInt(); } System.out.println(Arrays.toString(arrays)); } }
public class Demo08 { public static void main(String[] args) { Scanner scanner = new Scanner(System.in); System.out.print("请输入班级学生的人数:"); int num = scanner.nextInt(); String[] stuArrays = new String[num]; for (int i = 1; i <= stuArrays.length; i++) { System.out.print("请输入" + i + "位学生的名字:"); stuArrays[i - 1] = scanner.next(); } System.out.println(Arrays.toString(stuArrays)); } }
public class Demo09 { public static void main(String[] args) { // 考察对数组性质的理解,数组的长度一旦定义了就不能改变,因此需要新建一个数组 int[] arrays01 = {1, 2, 3, 4, 5}; int[] arrays02 = {10, 20, 30, 40, 50}; int[] newArrays = new int[arrays01.length + arrays02.length]; for (int i = 0; i < newArrays.length; i++) { if (i >= arrays01.length) { newArrays[i] = arrays02[i - arrays01.length]; } else { newArrays[i] = arrays01[i]; } } System.out.println(Arrays.toString(newArrays)); } }
public class Demo10 { public static void main(String[] args) { String[] arrays = new String[5]; Scanner scanner = new Scanner(System.in); int index = 0; for (int i = 0; i < arrays.length; i++) { System.out.print("请输入" + (i + 1) + "位用户的姓名:"); arrays[i] = scanner.next(); } // 检查数组是否有该姓名 System.out.print("请输入你要查找的姓名:"); String name = scanner.next(); for (int i = 0; i < arrays.length; i++) { if (name.equals(arrays[i])) { index = i; System.out.print("请输入新名字:"); arrays[i] = scanner.next(); } } System.out.println(Arrays.toString(arrays) + "该用户的下标为:" + index); } }
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