Java连接字符串。 Java String Concatenation Java diff String类和StringBuffer类 Java连接字符串。 import java.lang.*; public class StringDemo { public static void main(String[] args) { // print str1 String str1 = "self"; System.out.println(str1); // print str2 concatenated with str1 String str2 = str1.concat(" learning"); System.out.println(str2); // prints str3 concatenated with str2(and str1) String str3 = str2.concat(" center"); System.out.println(str3); } } Java String Concatenation Java diff String类和StringBuffer类