java中的错误划分

参见英文答案 > Integer division: How do you produce a double?????????????????????????????????????10个
我正在划分两个int值,我希望得到一个双倍的值.但它的工作非常奇怪,它在分割之前具有正确的值,但它没有给出正确的答案.

public void Analyse() {
        for (FlowPacket fp : this.flow.GetAll()) {
            if (fp.direction==1){
               this.sentPackets++;
               this.sentLength = this.sentLength + fp.packetLength;
            }
            else{
                this.receivedPackets++;
                this.receivedLength = this.receivedLength + fp.packetLength;
            }

        }
        if(this.receivedPackets==0)
                this.receivedPackets = 1;
    }


public double CalcRatio() {
            return (this.sentPackets/this.receivedPackets);
        }

– – – – – – – – – – – – – – 主要 – – – – – – – – – – – ———–

System.out.print("Sent packets: " + analyser.getTotalSentPackets() + ",");
System.out.print("Received packets: " + analyser.getTotalReceivedPackets() + ",");
System.out.print("ratio: " + analyser.CalcRatio() + ",");

—————————- outout ——————— ———

Sent packets: 2694,Received packets: 5753,ratio: 0

(double)this.sentPackets/this.receivedPackets