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分享public static void main(String[] args) {
StringBuilder s = new StringBuilder("TEST");
System.out.println(s.toString());
test(s);
System.out.println(s.toString());
test1(s);
System.out.println(s.toString());
}
public static void test(StringBuilder s){
s = new StringBuilder("1212121");
}
public static void test1(StringBuilder s){
s.append("A");
}