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小白学习字符串1.字符串，不可变特性// 字符串演示public class StringTest1{//public void test3(){ String s1 = "uplooking"; // 字符替换的时候，依然是创建新的字符串 String s2 = s1.replace('u','U'); System.out.println(s1); System.out.println(s2);}public void test2(){ String s1 = "