java中a++和++a或a--和--a有什么区别？
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what is the difference between a++ and ++a or a-- and --a in java?
提问by Ghadeer
public void push(E element) {
if (size == elements.length) {
resize(); // doubel of size
}
elements[size++] = element;
}
public E pop() {
if (size == 0) {
throw new java.util.EmptyStackException();
}
E element = elements[--size];
elements[size] = null; // set null in last top
return element;
}
what is the difference between a++ and ++a or a-- and --a in java
java中a++和++a或a--和--a有什么区别
thanks
谢谢
采纳答案by Denim Datta
a++or a--is postfix operation, meaning that the value of a will get changed after the evaluation of expression.
a++ora--是后缀操作，意思是 a 的值会在表达式求值后改变。
++aor --ais prefix operation, meaning that the value of a will get changed before the evaluation of expression.
++aor--a是前缀操作，意味着 a 的值将在表达式计算之前发生变化。
lets assume this;
让我们假设这一点；
a = 4;
b = a++; // first b will be 4, and after this a will be 5
// now a value is 5
c = ++a; // first a will be 6, then 6 will be assigned to c
Refer this answeralso.
也参考这个答案。
