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正确
String firstName = "John ";
String lastName = "Doe";
System.out.println(firstName.@(6)(lastName));
String firstName = "John ";
String lastName = "Doe";
System.out.println(firstName.concat(lastName));
不正确
点击 此处 重试 正确
下一题 ❯String firstName = "John "; String lastName = "Doe"; System.out.println(firstName.w3exercise_input_no_0(lastName)); |