I have a question about keyboard input of numbers

When the character input part of the following code is set to BufferedReader, it cannot be input normally. Why? Works fine with Scanner

		BufferedReader br = new 
                BufferedReader(newInputStreamReader(System.in));

		double max = Double.NEGATIVE_INFINITY;
		double min = Double.POSITIVE_INFINITY;
		double dat = 0;

		System.out.println(max + " " + min);

		for(int i = 0;i < 4;i++) {

			System.out.println("Numerical input");

			dat = br.read();　//here

			if(dat > max) {
				max = dat;
			}
			if(dat < min) {
				min = dat;
			}

		}
		System.out.println("Maximum value:" + max + " " + "minimum value:" +min);

	}

Execution result when using BufferedReader ↓

-Infinity Infinity Numerical input 1 Numerical input Numerical input Numerical input 2 Maximum value: 50.0 Minimum value: 10.0