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you could try

Imgproc.findContours(temp, contours, hierarchy, Imgproc.RETR_EXTERNAL, Imgproc.CHAIN_APPROX_SIMPLE);
for (int idx = 0; idx < contours.size(); idx++)
{
    MatOfPoint contour = contours.get(idx);
    Moments moment = Imgproc.moments(contour);
    double area = moment.m00;
    System.out.print( area );
}

you could try

import org.opencv.imgproc.Moments; // you should have this line to use Moments
.
.    
.
Imgproc.findContours(temp, contours, hierarchy, Imgproc.RETR_EXTERNAL, Imgproc.CHAIN_APPROX_SIMPLE);
for (int idx = 0; idx < contours.size(); idx++)
{
    MatOfPoint contour = contours.get(idx);
    Moments moment = Imgproc.moments(contour);
    double area = moment.m00;
    System.out.print( area );
}

you could try

import org.opencv.imgproc.Moments; // you should have this line to use Moments
.
.    
.
Imgproc.findContours(temp, contours, hierarchy, Imgproc.RETR_EXTERNAL, Imgproc.CHAIN_APPROX_SIMPLE);
for (int idx = 0; idx < contours.size(); idx++)
{
    MatOfPoint contour = contours.get(idx);
    Moments moment = Imgproc.moments(contour);
    double area = moment.m00;
    System.out.print( area );
}

for (int idx = 0; idx < contours.size(); idx++)
{
    MatOfPoint contour = contours.get(idx);
    double area = Imgproc.contourArea(contour);
    System.out.print( area );
}