java.lang--AbstractStringBuilder

版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/qq_18377515/article/details/83902476

void expandCapacity(int minimumCapacity) {

	//这里*2+2 容易超出int类型的长度,所以才会判断newCapacity这个是否小于0
	int newCapacity = value.length * 2 + 2;
	if (newCapacity - minimumCapacity < 0)
		newCapacity = minimumCapacity;
	if (newCapacity < 0) {
		if (minimumCapacity < 0) // overflow
			throw new OutOfMemoryError();
		newCapacity = Integer.MAX_VALUE;
	}
	value = Arrays.copyOf(value, newCapacity);
}