System.out.println("str1 starts with Hello: " + startsWithHello);

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public static void main(String[] args) {

num -= 5; // 相当于 num = num - 5;

System.out.println("Hello, World!");

ObjectOutputStream oos = new ObjectOutputStream(fos);

PrintWriter out = new PrintWriter(socket.getOutputStream(), true);

public static void main(String[] args) throws SQLException {

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public static void main(String[] args) {