public class a { int a=2; int b=3; public static void main(String[] arg) { new a(); } a() { System.out.println(a+b); }}
public static void main(String[] args) { System.out.println(3+5); }
public class a { public static void main(String[] arg) { int a=2; int b=3; System.out.println(a+b); }}
这个是通过程序参数的方式获得加数 public class Test{ public static void main(String[] args){ int sum, a,b; a=Integer.parseInt(args[0]); b=Integer.parseInt(args[1]); sum=a+b; System.out.println(a+"+"+b+"="+sum); } } 在dos下编译后输入 提示符:java Test 4 5 运行结果 提示符:4+5=9
这个是与程序交互输入加数 public class Test { public static void main(String[] args) { int sum,a=0,b=0; InputStreamReader ir=new InputStreamReader(System.in); BufferedReader in=new BufferedReader(ir); try { System.out.print("input a:"); a=Integer.parseInt(in.readLine()); System.out.print("input b :"); b=Integer.parseInt(in.readLine()); in.close(); } catch (IOException ex) { ex.printStackTrace(); } sum=a+b; System.out.println("a+b="+sum); } }
{
int a=2;
int b=3;
public static void main(String[] arg)
{
new a();
}
a()
{
System.out.println(a+b);
}}
{
System.out.println(3+5);
}
{
public static void main(String[] arg)
{ int a=2;
int b=3;
System.out.println(a+b);
}}
public class Test{
public static void main(String[] args){
int sum, a,b;
a=Integer.parseInt(args[0]);
b=Integer.parseInt(args[1]);
sum=a+b;
System.out.println(a+"+"+b+"="+sum);
}
}
在dos下编译后输入
提示符:java Test 4 5
运行结果
提示符:4+5=9
public class Test {
public static void main(String[] args) { int sum,a=0,b=0;
InputStreamReader ir=new InputStreamReader(System.in);
BufferedReader in=new BufferedReader(ir);
try {
System.out.print("input a:");
a=Integer.parseInt(in.readLine());
System.out.print("input b :");
b=Integer.parseInt(in.readLine());
in.close();
} catch (IOException ex) {
ex.printStackTrace();
}
sum=a+b;
System.out.println("a+b="+sum);
}
}