学海网

JAVA大学实用教程第二版习题解答,49页。
第一章 作业题
1．
public class Hello{
public static void main (String args[ ]){
System.out.pintln(“早上好，good Morning”);
}
}

2．
import java.applet.*;
import java.awt.*;
public class Boy extends Applet {
public void paint(Graphics g) {
g.setColor(Color.blue);
g.drawString("你好,hello",12,30);
}
}

第二章 作业题
1．
public class ZuoYe2_1{
public static void main (String args[ ]){
char c=’а’;
System.out.println("字母"+c+"在unicode表中的顺序位置:"+(int)c);
System.out.println("字母表：");
while(c﹤=’я’){
System.out.print(" "+c);
c=(char)(c+1);
}
}
}
2．
import java.util.*;
public class ZuoYe2_2{
public static void main (String args[ ]){
Scanner reader=new Scanner(System.in);
long chengji=1;
int m=0;
while(reader.hasNextInt()){
int x=reader.nextInt();
m=m+1;
chengji=chengji*x;
}
System.out.println(m+"个数的乘积为"+chengji);
}
}
第三章 作业题
1．
import java.util.*;
public class ZuoYe3_1{
public static void main (String args[ ]){
Scanner reader=new Scanner(System.in);
double y=0,x=0;
x=reader.nextDouble();
if(x﹤0)
y=-1+2*x;
else if(x==0)
y=-1;
else if(x﹥0)
y=-1+3*x;
System.out.println(y);
}
}
......