Java 对象变量可能尚未初始化
我找不到在右侧生成的错误。GetText();接近底部。错误是上面的标题。从我所读到的内容来看,成员变量必须用Java初始化,所以我通读了一遍,看了所有这些都没有用。我认为我在默认构造函数中做的一切都是正确的,但我可能错了,这是我的第一个java程序。谢谢你的帮助,我只是不想在这上面再花一个小时Java 对象变量可能尚未初始化,java,class-design,Java,Class Design,我找不到在右侧生成的错误。GetText();接近底部。错误是上面的标题。从我所读到的内容来看,成员变量必须用Java初始化,所以我通读了一遍,看了所有这些都没有用。我认为我在默认构造函数中做的一切都是正确的,但我可能错了,这是我的第一个java程序。谢谢你的帮助,我只是不想在这上面再花一个小时 import java.io.*; import java.lang.*; //class Shapes //{ class Triangle { private
import java.io.*;
import java.lang.*;
//class Shapes
//{
class Triangle
{
private int rowNum;
private String text;
Triangle() {
rowNum=0;
text="";
}
public void GetText()
{
int flag=0;
String trialText="";
while(flag==0){
BufferedReader reader= new BufferedReader(new InputStreamReader(System.in));
System.out.println("\nPlease enter a word to display in the triangle(ie bob, tom, etc.)");
try{
trialText = reader.readLine();
System.out.println("Your entered "+ trialText); //print the data entered by the user
}
catch (IOException ioe){ //statement to execute if an input/output exception occurs
System.out.println("An unexpected error occured.");
continue;
}
char[] newText=trialText.toCharArray();
for(int i=0;i<trialText.length();i++){
if(!Character.isLetter(newText[i])){
System.out.println(newText[i]+"is not a letter, please enter a real word.");
flag=0;
break;
}
flag=1;
}
}//While(flag==0)
text=trialText;
text=text.toLowerCase(); //Converting all input text to Lower Case
}
public void ShowText()
{
System.out.println(text);
}
public void ShowRowNum()
{
System.out.println(rowNum);
}
/*
public boolean testText(String new_Text)
{
try{
String trialText = new_Text;
System.out.println("You entered "+trialText); //print the data entered by the user
}
catch (IOException ioe){ //statement to execute if an input/output exception occurs
System.out.println("An unexpected error occured.");
return false;
}
return true;
}
*/
public boolean testRowNum(String new_Text)
{
try{
Integer.parseInt(new_Text);
System.out.println("You entered "+ new_Text); //print the data entered by the user
}
catch (NumberFormatException nfe){ //statement to execute if an input/output exception occurs
System.out.println("You have entered a non-integer. ");
return false;
}
return true;
}
public void GetRows()
{
System.out.println("Please enter the number of rows the triangle will contain");
BufferedReader newRow= new BufferedReader(new InputStreamReader(System.in));
try{
if(testRowNum(newRow.readLine().trim())==true)
rowNum=Integer.parseInt(newRow.readLine().trim());
}
catch (IOException ioe) {//statement to execute if an input/output exception occurs
System.out.println("You have entered a non-integer. ");
}
}
public void DisplayTriangle()
{
int numSpaces=0;
String spaces="";
String bricks="";
for(int i=0; i<rowNum; i++){
if(rowNum%2==0)
numSpaces=(rowNum/2);
else if(rowNum%2==1)
numSpaces=((rowNum/2)-1);
for(int j=numSpaces; j>0; j--){
spaces=spaces+" ";
}
for(int k=0; k<rowNum; k++){
bricks=bricks+"=";
}
System.out.println(spaces+bricks);
}
}
public static void main(String args[])
{
Triangle right;
right.GetText();
right.GetRows();
right.ShowText();
right.ShowRowNum();
right.DisplayTriangle();
}
}
//}
import java.io.*;
导入java.lang.*;
//类形状
//{
阶级三角
{
私有int rowNum;
私有字符串文本;
三角形(){
rowNum=0;
text=“”;
}
public-void-GetText()
{
int标志=0;
字符串trialText=“”;
while(标志==0){
BufferedReader reader=新的BufferedReader(新的InputStreamReader(System.in));
System.out.println(“\n请输入一个单词显示在三角形中(如bob、tom等)”;
试试{
trialText=reader.readLine();
System.out.println(“您输入的”+trialText);//打印用户输入的数据
}
catch(IOException ioe){//在发生输入/输出异常时要执行的语句
System.out.println(“发生意外错误”);
继续;
}
char[]newText=trialText.toCharArray();
对于(int i=0;i在ur main fn中尝试此方法:
Triangle right = new Triangle();
您必须初始化三角形
尝试以下操作:
public static void main(String args[])
{
Triangle right = new Triangle();
right.GetText();
right.GetRows();
right.ShowText();
right.ShowRowNum();
right.DisplayTriangle();
}
你试图在它有任何东西之前打电话给right
,它只是被声明了。lol你的问题不在C++
试试我的答案,然后再给我回电话(是/否/有时——取决于情况)这太丢脸了,我知道LOL。在堆栈中,你应该选择一个答案作为已接受
,更多的人会希望在你未来的问题上提供帮助^ ^@ChadMTriangle right;right.getText();
在Java中就像Triangle*right;right->getText()在C++中,与唯一的区别是java中未初始化的变量会导致编译时错误。