用java语言写出这一段伪代码

//声明一个整数变量num1和num2
int num1, num2;
//给num1和num2赋值
num1 = 10;
num2 = 20;
//计算num1和num2的和并将结果赋值给变量sum
int sum = num1 + num2;
//输出变量sum的值
System.out.println("The sum of num1 and num2 is: " + sum);