Java三元运算符语法

在第一种情况下,三元运算符返回y的值,因为x = 4并且print语句按预期打印5.

在第二种情况下,三元运算符首先将y的值赋给x,然后返回该值.再次,它按预期打印5.

在第三种情况下,三元运算符在左边的x = y：和x = z在右边：.我希望这与第二种情况非常相似.但是,这个语句甚至没有编译.

任何理解这一点的帮助将非常感激.

public class Test {

    public static void main(String[] args) {
        int x = 4;
        int y = 5;
        int z = -1;

        x = (x == 4) ? y : z;        // compiles and runs fine
        System.out.println(x + " " + y + " " + z);

        x = (x == 4) ? x = y : z;    // compiles and runs fine
        System.out.println(x + " " + y + " " + z);

        x = (x == 4) ? x = y : x = z;  // Does not compile
        System.out.println(x + " " + y + " " + z);
    }
}