java中的String和StringBuffered

1 public class String_Problem {
2     public static void main(String[] args) {
3         String s = null;
4         s = s.toString() + 1;
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1 //s = s+1;
2 此语句可以解释为
3         //StringBuilder sb = new StringBuilder();
4         //sb.append(s);
5         //sb.append(1);
6         //s = sb.toString();
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1         System.out.println(s);
2     }
3 }
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原文地址：https://www.cnblogs.com/sxmcACM/p/3484600.html