Java 基础代码练习:磨练你的编程技能264
简介
作为一名程序员,扎实的 Java 基础至关重要。通过代码练习,你可以巩固概念、提高语法熟练度并培养解决问题的能力。本文提供了一系列循序渐进的 Java 基础代码练习,帮助你提升编程技能。
练习 1:基本数据类型和运算符
public class DataTypesAndOperators {
public static void main(String[] args) {
int age = 25;
double weight = 75.5;
char gender = 'M';
boolean isMarried = false;
("Age: " + age);
("Weight: " + weight);
("Gender: " + gender);
("Is Married: " + isMarried);
}
}
练习 2:条件语句
public class ConditionalStatements {
public static void main(String[] args) {
int age = 25;
if (age >= 18) {
("Eligible to vote");
} else {
("Not eligible to vote");
}
}
}
练习 3:循环语句
public class LoopStatements {
public static void main(String[] args) {
for (int i = 1; i {
for (int i = 1; i {
for (int i = 11; i (n));
}
}
练习 11:流
public class Streams {
public static void main(String[] args) {
List numbers = (1, 2, 3, 4, 5);
()
.filter(n -> n % 2 == 0)
.forEach(n -> (n));
}
}
练习 12:JDBC 连接数据库
public class JdbcExample {
public static void main(String[] args) throws SQLException {
try (Connection connection = ("jdbc:mysql://localhost:3306/my_database", "root", "password")) {
Statement statement = ();
ResultSet resultSet = ("SELECT * FROM users");
while (()) {
(("id") + " " + ("name"));
}
}
}
}
练习 13:JUnit 测试
public class UnitTestExample {
@Test
public void addNumbers() {
assertEquals(5, (2, 3));
}
}
练习 14:反射
public class ReflectionExample {
public static void main(String[] args) throws ClassNotFoundException {
Class clazz = ("");
Method[] methods = ();
for (Method method : methods) {
(());
}
}
}
练习 15:NIO
public class NioExample {
public static void main(String[] args) throws IOException {
Path path = ("");
try (FileChannel channel = (path, )) {
ByteBuffer buffer = (1024);
(buffer);
();
while (()) {
((char) ());
}
}
}
}
这些 Java 基础代码练习旨在帮助你夯实基础知识,培养独立解决问题的能力。通过反复练习,你可以增强语法熟练度、掌握核心概念,并为更高级别的编程挑战做好准备。随着你完成这些练习并继续实践,你的 Java 编程技能将不断提升。
2024-12-03
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