获取java.lang.double无法强制转换为java.lang.long [英] Getting java.lang.double cannot be cast to java.lang.long

问题描述

private void RecalculateFreqencies1（）

{

int inputDivider = 0;

int outputDivider = 0;

int fbDivider = 0;

double tempFrequency = 0.f;

double nearestFrequency = 0.f;

long targetFrequencyLong =（long） spn_TargetFrequency1.getValue（）;

double targetFrequency =（double）targetFrequencyLong;



if（targetFrequencyLong == 50000000）

{

tempFrequency =（（double）_inputFrequency /（double）20）*（double）800 /（double）32;

nearestFrequency = tempFrequency;

_pllidivEstimate = 20;

_pllodivEstimate1 = 32;

_pllfbEstimate = 800;

_pllodivEstimate2 = 10;

}



int outputspn2 = _pllodivEstimate1 / 3;

if（outputspn2< 1）

outputspn2 = 1;

spnfreq2 =（（double）_inputFrequency /（double）_pllidivEstimate）* （double）_pllodivEstimate1 /（double）outputspn2;

spn_TargetFrequency2.setValue（spnfreq2）;



}

private void RecalculateFreqencies2（）

{

long targetFrequencyLong2 =（long）spn_TargetFrequency2.getValue（）;

}



我尝试过：



获取java.lang.Double无法转换为java。 lang.Long exceptionthis here

private void RecalculateFreqencies2（）

{

long targetFrequencyLong2 =（long）spn_TargetFrequency2.getValue（） ; //例外

}

解决方案

参见 Double（Java Platform SE 7） [ ^ ]。

< blockquote>执行RecalculateFreqencies2（）注释RecalculateFreqencies1（），未看到异常。 RecalculateFreqencies1（）设置spn_TargetFrequency2值。这个值是在RecalculateFreqencies2（）中使用
获取的。
long targetFrequencyLong2 =（long）spn_TargetFrequency2.getValue（）;

这里我得到java.lang.Double不能被强制转换到java.lang.Long异常

private void RecalculateFreqencies1()
{
int inputDivider = 0;
int outputDivider = 0;
int fbDivider = 0;
double tempFrequency = 0.f;
double closestFrequency = 0.f;
long targetFrequencyLong = (long)spn_TargetFrequency1.getValue();
double targetFrequency = (double)targetFrequencyLong;

if(targetFrequencyLong == 50000000)
{
tempFrequency = ( (double)_inputFrequency / (double) 20 ) * (double) 800 / (double) 32;
closestFrequency = tempFrequency;
_pllidivEstimate = 20;
_pllodivEstimate1 = 32;
_pllfbEstimate = 800;
_pllodivEstimate2 = 10;
}

int outputspn2 = _pllodivEstimate1/3;
if (outputspn2<1)
outputspn2 = 1;
spnfreq2 = ( (double)_inputFrequency / (double) _pllidivEstimate ) * (double) _pllodivEstimate1 / (double)outputspn2;
spn_TargetFrequency2.setValue(spnfreq2);

}
private void RecalculateFreqencies2()
{
long targetFrequencyLong2 = (long)spn_TargetFrequency2.getValue();
}

What I have tried:

Getting "java.lang.Double cannot be cast to java.lang.Long exception" here
private void RecalculateFreqencies2()
{
long targetFrequencyLong2 = (long)spn_TargetFrequency2.getValue();//exception
}

解决方案

See Double (Java Platform SE 7 )[^].

on executing RecalculateFreqencies2() commenting RecalculateFreqencies1(), exception not seen. RecalculateFreqencies1() sets "spn_TargetFrequency2" value. This value is fetched in RecalculateFreqencies2() using
long targetFrequencyLong2 = (long)spn_TargetFrequency2.getValue();
Here i am getting "java.lang.Double cannot be cast to java.lang.Long exception

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