先輸入的為i 後輸入的為j
2. The identifier BufferedReader is normally abbreviated as BR in programming language C. However, Java programmers normally do not use abbreviations for identifiers. What are the advantages and disadvantages of not using abbreviations?
在過去電腦還不發達的年代，C語言中使用縮寫是要節省記憶體的損耗
而JAVA不使用縮寫的好處是可讓人淺顯易懂，壞處是佔記憶體。
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