import java.util.Scanner; public class ScannerDemo { public static void main(String[] args) { Scanner scan = new Scanner(System.in); // 从键盘接收数据 // next方式接收字符串 System.out.println("next方式接收:"); // 判断是
char ch = 'a'; // Unicode 字符表示形式char uniChar = '\u039A'; // 字符数组char[] charArray ={ 'a', 'b', 'c', 'd', 'e' }; public class Test { public static void main(String args[]) {
public class Test { public static void main(String args[]){ int x = 10; if( x < 20 ){ System.out.print("这是 if 语句"); } }} if(布尔表达式){ //如果布尔表达式的值为true}else{ //如果布尔表达式的值为false} public class Test {
<?php$servername = "localhost";$username = "root";$password = "admin";// 创建连接$conn = new mysqli($servername, $username, $password);// 检测连接if ($conn->connect_error) { die("连接失败: " . $conn->connect_error);
<?php $t=date("H"); if ($t<"20") { echo "Have a good day!"; } ?> <?php $t=date("H"); if ($t<"10") { echo "Have a good morning!"; } elseif ($t<"20&q
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<?php// 区分大小写的常量名define("GREETING", "欢迎访问 Runoob.com");echo GREETING; // 输出 "欢迎访问 Runoob.com"echo '<br>';echo greeting; // 输出 "greeting"?> <?php// 不区分大小写的常量名define("GREETING&quo
<?php$x = "Hello world!";echo $x;echo "<br>";$x = 'Hello world!';echo $x;?> <?php$x = 5985;var_dump($x);echo "<br>";$x = -345; // 负数var_dump($x);echo "<br>";$x = 0x8C; // 十六进制
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