我对String连接感到困惑.
String s1 = 20 + 30 + "abc" + (10 + 10); String s2 = 20 + 30 + "abc" + 10 + 10; System.out.println(s1); System.out.println(s2);
输出是:
50abc20
50abc1010
我想知道为什么在这两种情况下都会将20 30加在一起,但10 10需要括号才能被添加(s1)而不是连接到字符串(s2).请解释String运算符如何在这里工作.
解决方法
加法是左联的.采取第一种情况
20+30+"abc"+(10+10) ----- ------- 50 +"abc"+ 20 <--- here both operands are integers with the + operator,which is addition --------- "50abc" + 20 <--- + operator on integer and string results in concatenation ------------ "50abc20" <--- + operator on integer and string results in concatenation
在第二种情况:
20+30+"abc"+10+10 ----- 50 +"abc"+10+10 <--- here both operands are integers with the + operator,which is addition --------- "50abc" +10+10 <--- + operator on integer and string results in concatenation ---------- "50abc10" +10 <--- + operator on integer and string results in concatenation ------------ "50abc1010" <--- + operator on integer and string results in concatenation
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