Lists.newArrayListWithExpectedSize( int estimatedSize)

Lists.newArrayListWithExpectedSize( int estimatedSize) 构造一个期望长度为estimatedSize的ArrayList实例。

源码：

public static <E> ArrayList<E> newArrayListWithExpectedSize(int estimatedSize) {return new ArrayList(computeArrayListCapacity(estimatedSize));
}

//计算集合的容量
@VisibleForTesting
static int computeArrayListCapacity(int arraySize) {
//判断是否小于0，小于0则抛出异常。CollectPreconditions.checkNonnegative(arraySize, "arraySize");return Ints.saturatedCast(5L + (long)arraySize + (long)(arraySize / 10));
}

//检查是否小于0
@CanIgnoreReturnValue
static int checkNonnegative(int value, String name) {if (value < 0) {throw new IllegalArgumentException(name + " cannot be negative but was: " + value);} else {return value;}
}

//判断计算出来的数组长度是否在int的范围内
public static int saturatedCast(long value) {if (value > 2147483647L) {return 2147483647;} else {return value < -2147483648L ? -2147483648 : (int)value;}
}

转载于:https://www.cnblogs.com/fflower/p/10784890.html

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