public class Test {
public static void main(String[] args) {
int a=5;//int占用4个字节
double b=a;//double占用8个字节;
System.out.println(a);
System.out.println(b);
//运行结果:a=5;b=5.0
long num1=5l;//long占用8个字节
float num2=num1;//float占用4个字节;
System.out.println(num1);
System.out.println(num2);
//运行结果:num1=5;num2=5.0
//虽然long占用8个字节,float占用4个字节,但是float的取值范围要比long大;
}
}