到目前为止，几乎所有人都对运算符优先级的求值顺序感到困惑.在Java中，优先级规则使表达式等同于以下内容:

Almost everybody so far has confused order of evaluation with operator precedence. In Java the precedence rules make the expression equivalent to the following:

a + (b  * c) / ( d - e )

因为*和/具有相同的优先级，并且保持关联性.

because * and / have equal precedence and are left associative.

评估顺序严格定义为首先是左操作数，然后是右操作数，然后是(||和&&除外).因此，评估顺序为:

The order of evaluation is strictly defined as left hand operand first, then right, then operation (except for || and &&). So the order of evaluation is:

  a
      b
      c
    *
      d
      e
    -
  /
+

评估顺序在页面上.缩进反映了语法树的结构

order of evaluation goes down the page. Indentation reflects the structure of the syntax tree

修改

回应Grodriguez的评论.以下程序:

In response to Grodriguez's comments. The following program:

public class Precedence 
{
    private static int a()
    {
        System.out.println("a");
        return 1;
    }   
    private static int b()
    {
        System.out.println("b");
        return 2;
    }
    private static int c()
    {
        System.out.println("c");
        return 3;
    }
    private static int d()
    {
        System.out.println("d");
        return 4;
    }
    private static int e()
    {
        System.out.println("e");
        return 5;
    }

    public static void main(String[] args) 
    {
        int x = a() + b() * c() / (d() - e());
        System.out.println(x);
    } 
}

产生输出

a
b
c
d
e
-5

清楚地表明乘法是在减法之前 执行的.

which clearly shows the multiplication is performed before the subtraction.