public class MyTest {public static void main(String[] args) {int a=2;int b=6;int c=a+b;System.out.println("结果为"+c);}}
与C语言有些类似
上面的方式不太灵活,我们进行改进
控制台方式
import java.io.*;public class MyTest {/*两数求和*/public static void main(final String[] args) throws IOException {System.out.println("请输入一个整数:");final byte t[] = new byte[10];System.in.read(t);final String sl = new String(t);final int a = Integer.parseInt(sl.trim());System.out.println("请输入一个小数:");System.in.read(t);final String s2 = new String(t);final double b = Double.parseDouble(s2.trim());// 处理数据final double c = a + b;System.out.println("计算结果为:"+c);}}
GUI
import javax.swing.JOptionPane;public class MyTest {/*两数求和*/public static void main(final String[] args) {//输入数据//图形化输入方案String s1=JOptionPane.showInputDialog("请输入一个整数:");int a=Integer.parseInt(s1);String s2=JOptionPane.showInputDialog("请输入一个小数:");double b=Double.parseDouble(s2);//处理数据double c=a+b;//输出结果JOptionPane.showMessageDialog(null,"结果为:"+a+"+"+b+"="+c);}}