Java 意外的结果-可以请一些人指出错误吗
在花了数小时尝试不同的东西之后,我无法找出我的代码的错误,这是一个简单的程序:`Java 意外的结果-可以请一些人指出错误吗,java,arrays,Java,Arrays,在花了数小时尝试不同的东西之后,我无法找出我的代码的错误,这是一个简单的程序:` public class AssignGrades { private int ntotal=0; private int []y; //constructor to initialize class instances AssignGrades(int t) { ntotal = t; //y = num1; } AssignGrades( int []num1) { y=nu
public class AssignGrades {
private int ntotal=0;
private int []y;
//constructor to initialize class instances
AssignGrades(int t)
{
ntotal = t;
//y = num1;
}
AssignGrades( int []num1)
{
y=num1;
for (int i=0;i<y.length;i++)
y[i] = num1[i];
}
//method to sort grades int []num1
void setGrades()
{
int [] y = new int[ntotal];
for (int i=0;i<y.length;i++)
{
//assign grades
if
(y[i]<80){
System.out.println("grade is A" +y[i]);}
else if (y[i]<70)
System.out.println("grade is B" +y[i]);
else if (y[i]<60)
System.out.println("grade is c" +y[i]);
else
System.out.println("FAIL" +y[i]);
}
}
//show student grades - to print array[] values
void showGrades()
{
for (int u: y)
System.out.println(u);
}
问题:现在在输出“A”和“0”中->问题出在哪里,看起来数组没有初始化,所有值都显示为零:但是当我单独打印它们时,它们被初始化了
请让我知道,如果需要更多的澄清。谢谢您有一个名为y的局部变量和一个名为y的类变量。这似乎就是问题所在。你用的是本地的y,但我想你是想用y类的 好的,你的代码有很多问题。这是固定版本
public class AssignGrades {
private int[] y;
public AssignGrades(int[] num1) {
y = num1;
}
// method to set grades
void setGrades() {
for (int i = 0; i < y.length; i++)
{
// assign grades
if (y[i] < 50)
System.out.println("FAIL" + y[i]);
else if (y[i] < 60)
System.out.println("grade is C" + y[i]);
else if (y[i] < 70)
System.out.println("grade is B" + y[i]);
else if (y[i] < 80) {
System.out.println("grade is A" + y[i]);
}
}
}
// method to show student grades
void showGrades() {
for (int u : y){
System.out.println(u);
}
}
}
import java.util.Scanner;
public class AssignGradesDemo {
public static void main(String[] args) {
int t = 0;
System.out.println("enter no of students");
Scanner input = new Scanner(System.in);
t = input.nextInt();
int[] num1 = new int[t];
System.out.println("enter grades");
for (int i = 0; i < num1.length; i++) {
num1[i] = input.nextInt();
}
input.close();
AssignGrades ag = new AssignGrades(num1);
ag.setGrades();
ag.showGrades();
}
}
公共类{
私有int[]y;
公共交通等级(整数[]num1){
y=num1;
}
//设置等级的方法
无效等级(){
对于(int i=0;i
您有一个名为y的局部变量和一个名为y的类变量。这似乎就是问题所在。你用的是本地的y,但我想你是想用y类的
好的,你的代码有很多问题。这是固定版本
public class AssignGrades {
private int[] y;
public AssignGrades(int[] num1) {
y = num1;
}
// method to set grades
void setGrades() {
for (int i = 0; i < y.length; i++)
{
// assign grades
if (y[i] < 50)
System.out.println("FAIL" + y[i]);
else if (y[i] < 60)
System.out.println("grade is C" + y[i]);
else if (y[i] < 70)
System.out.println("grade is B" + y[i]);
else if (y[i] < 80) {
System.out.println("grade is A" + y[i]);
}
}
}
// method to show student grades
void showGrades() {
for (int u : y){
System.out.println(u);
}
}
}
import java.util.Scanner;
public class AssignGradesDemo {
public static void main(String[] args) {
int t = 0;
System.out.println("enter no of students");
Scanner input = new Scanner(System.in);
t = input.nextInt();
int[] num1 = new int[t];
System.out.println("enter grades");
for (int i = 0; i < num1.length; i++) {
num1[i] = input.nextInt();
}
input.close();
AssignGrades ag = new AssignGrades(num1);
ag.setGrades();
ag.showGrades();
}
}
公共类{
私有int[]y;
公共交通等级(整数[]num1){
y=num1;
}
//设置等级的方法
无效等级(){
对于(int i=0;i
您有一个名为y的局部变量和一个名为y的类变量。这似乎就是问题所在。你用的是本地的y,但我想你是想用y类的
好的,你的代码有很多问题。这是固定版本
public class AssignGrades {
private int[] y;
public AssignGrades(int[] num1) {
y = num1;
}
// method to set grades
void setGrades() {
for (int i = 0; i < y.length; i++)
{
// assign grades
if (y[i] < 50)
System.out.println("FAIL" + y[i]);
else if (y[i] < 60)
System.out.println("grade is C" + y[i]);
else if (y[i] < 70)
System.out.println("grade is B" + y[i]);
else if (y[i] < 80) {
System.out.println("grade is A" + y[i]);
}
}
}
// method to show student grades
void showGrades() {
for (int u : y){
System.out.println(u);
}
}
}
import java.util.Scanner;
public class AssignGradesDemo {
public static void main(String[] args) {
int t = 0;
System.out.println("enter no of students");
Scanner input = new Scanner(System.in);
t = input.nextInt();
int[] num1 = new int[t];
System.out.println("enter grades");
for (int i = 0; i < num1.length; i++) {
num1[i] = input.nextInt();
}
input.close();
AssignGrades ag = new AssignGrades(num1);
ag.setGrades();
ag.showGrades();
}
}
公共类{
私有int[]y;
公共交通等级(整数[]num1){
y=num1;
}
//设置等级的方法
无效等级(){
对于(int i=0;i
您有一个名为y的局部变量和一个名为y的类变量。这似乎就是问题所在。你用的是本地的y,但我想你是想用y类的
好的,你的代码有很多问题。这是固定版本
public class AssignGrades {
private int[] y;
public AssignGrades(int[] num1) {
y = num1;
}
// method to set grades
void setGrades() {
for (int i = 0; i < y.length; i++)
{
// assign grades
if (y[i] < 50)
System.out.println("FAIL" + y[i]);
else if (y[i] < 60)
System.out.println("grade is C" + y[i]);
else if (y[i] < 70)
System.out.println("grade is B" + y[i]);
else if (y[i] < 80) {
System.out.println("grade is A" + y[i]);
}
}
}
// method to show student grades
void showGrades() {
for (int u : y){
System.out.println(u);
}
}
}
import java.util.Scanner;
public class AssignGradesDemo {
public static void main(String[] args) {
int t = 0;
System.out.println("enter no of students");
Scanner input = new Scanner(System.in);
t = input.nextInt();
int[] num1 = new int[t];
System.out.println("enter grades");
for (int i = 0; i < num1.length; i++) {
num1[i] = input.nextInt();
}
input.close();
AssignGrades ag = new AssignGrades(num1);
ag.setGrades();
ag.showGrades();
}
}
公共类{
私有int[]y;
公共交通等级(整数[]num1){
y=num1;
}
//设置等级的方法
无效等级(){
对于(int i=0;i