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Main.java

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public class Main {

public static void main(String[] args) {

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

StringBuilder sb = new StringBuilder();

for (char c = 'g'; c < 'f'; c++) {

sb.append(c);

}

// append 方法支持拼接字符、字符串、数字等类型

sb.append('g').append("hij").append(123);

System.out.println(sb.toString());

}

}