填空题
[说明] 编写一个Application，从键盘输入整数n，并计算从1到n的累加和。
import java. io. *;
public class Application1 {
public static void main(String [] args) {
String s = " ";
int n, sum = 0;
System. out. println (“计算从1到n 的累加和。”);
System. out. print( “请输入n的值:”);
try {
{{U}}(1) {{/U}}
BufferedReader br = new BufferedReader(isr);
{{U}}(2) {{/U}}
}
catch(Exception e) { }
{{U}} (3) {{/U}}
for(int i=l; i＜ =n; i++)
{{U}} (4) {{/U}}
System. out. println ( “你刚才的输入是：” + n);
System. out. println ( “1到n的累加和是：”+ sum);
}
}
【正确答案】
1、InputStreamReader isr = new InputStreamReader ( System. in);
【答案解析】s = br. readLine( );
n = Integer. parseInt(s);
return( “姓名”:+ name + “学号：”+ id + “联系电话：” +phone) ;