带+运算符的Java字符串串联

加法保持关联。以第一种情况

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

在第二种情况下：

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