问题描述
import java.awt.*;
import javax.swing.*;
public class Drawing extstrong textends JApplet{
int choice;
public void init(){
String input;
input=JOptionPane.showInputDialog(
"Enter 1 to draw lines\n"+
"Enter 2 to draw squares\n"+
"Enter 3 to draw circles\n");
choice=Integer.parseInt(input);
}/* how to change it to string like key in line square and circle not 1,2,3*/
public void paint(Graphics g){
int[] x = {300,293,276,250,217,183,151,124,107,101,107,124,150,183,217,249,276,293};
int[] y = {200,234,264,286,298,298,286,264,234,200,166,136,114,102,102,114,136,166};
for(int i=0; i<18; i++){
if( choice == 1 ){
g.drawLine(200,200,x[i],y[i]);}
else if( choice == 2 ){
g.drawRect(x[i],y[i],100,100);}
else{
g.drawOval(x[i],y[i],100,100);}
}
}
}
1楼
如果我理解正确，您希望用户输入单词（字符串）而不是使用数字来做出选择。 比您可以这样尝试：
public class Drawing extstrong textends JApplet{
int choice;
public void init(){
String input;
input=JOptionPane.showInputDialog(
"Enter \"lines\" to draw lines\n"+
"Enter \"squares\" to draw squares\n"+
"Enter anything else to draw circles\n");
choice = input;
}/* how to change it to string like key in line square and circle not 1,2,3*/`how to change`
public void paint(Graphics g){
int[] x = {300,293,276,250,217,183,151,124,107,101,107,124,150,183,217,249,276,293};
int[] y = {200,234,264,286,298,298,286,264,234,200,166,136,114,102,102,114,136,166};
for(int i=0; i<18; i++){
if( choice.equals("lines") ){
g.drawLine(200,200,x[i],y[i]);}
else if( choice.equals("squares") ){
g.drawRect(x[i],y[i],100,100);}
else{
g.drawOval(x[i],y[i],100,100);}
}
}
}
2楼
public class Drawing extends JApplet{
String choice;
public void init(){
String input;
input=JOptionPane.showInputDialog(
"Enter line to draw lines\n"+
"Enter square to draw squares\n"+
"Enter circle to draw circles\n");
//choice=Integer.parseInt(input);
choice=input;
}
public void paint(Graphics g){
int[] x = {300,293,276,250,217,183,151,124,107,101,107,124,150,183,217,249,276,293};
int[] y = {200,234,264,286,298,298,286,264,234,200,166,136,114,102,102,114,136,166};
for(int i=0; i<18; i++){
if( choice .equals("line") ){
g.drawLine(200,200,x[i],y[i]);}
else if(choice .equals("square") ){
g.drawRect(x[i],y[i],100,100);}
else{
g.drawOval(x[i],y[i],100,100);}
}
}}