Question

可能重复：
Exception in thread “main” java.lang.UnsupportedClassVersionError: a (Unsupporte d major.minor version 51.0)

我目前正在开设一个实验室作业的课程。我写了课，我的教授提供了主要课程。当我运行她在Net Beans中提供的main.class时，我收到以下错误：

java.lang.UnsupportedClassVersionError：csit1520 / lab1f / Main：不支持的major.minor版本51.0 at java.lang.ClassLoader.defineClass1（Native Method）在java.lang.ClassLoader.defineClassCond（ClassLoader.java:631） at java.lang.ClassLoader.defineClass（ClassLoader.java:615） at java.security.SecureClassLoader.defineClass（SecureClassLoader.java:141） at java.net.URLClassLoader.defineClass（URLClassLoader.java:283） at java.net.URLClassLoader.access $ 000（URLClassLoader.java:58）在java.net.URLClassLoader $ 1.run（URLClassLoader.java:197） at java.security.AccessController.doPrivileged（Native Method）在java.net.URLClassLoader.findClass（URLClassLoader.java:190） at java.lang.ClassLoader.loadClass（ClassLoader.java:306）在sun.misc.Launcher $ AppClassLoader.loadClass（Launcher.java:301） at java.lang.ClassLoader.loadClass（ClassLoader.java:247）找不到主类：csit1520.lab1f.Main。程序将会退出。线程“main”Java结果中的异常：1 ____________________________________

我还附加了我的CreditCard.class和main.class。任何帮助是极大的赞赏。我是编程新手，不知道我做错了什么。

THE MAIN CLASS
package csit.lab1f;
import java.util.Scanner;

 /**
 *
 */
 public class Main {
 public static void main(String a[] )
{
    Scanner input = new Scanner( System.in );
    double balance; // user entered

    // get first balance from user
    System.out.println( "Enter account balance(0 to end): ");
    balance = input.nextDouble();
    while ( balance != 0 )
   {
        // get a credit card with user entered balance
        CreditCard c = new CreditCard( balance );
        // calculate card's new interest, balance, min payment
        c.calculateStatement();
        // print card's statement
        c.printStatement();
        // get next balance
        System.out.println( "Enter account balance (0 to end): ");
        balance = input.nextDouble();
    }
}
}

MY CREDIT CARD CLASS

package csit.lab1f;

/**
 *
 * 
 */
public class CreditCard {

  public final static double MINIMUM_PAYMENT_PERCENT = 0.1;
  public final static double HIGH_INTEREST_BORDER = 1000;
  public final static double HIGH_INTEREST = 0.015;
  public final static double LOW_INTEREST = 0.01;
  public final static double MINIMUM_PAYMENT = 10.0;    
  int nextAccountNumber = 12340000;

  private int accountID;
  private double previousBalance;
  private double interest;
  private double currentBalance = interest + previousBalance;
  private double minimumPayment;



  public CreditCard(){
  accountID = nextAccountNumber;
  nextAccountNumber++;
  previousBalance = 0;
  interest = 0;
  minimumPayment = 0;
  currentBalance = 0;}

  public CreditCard(double b){
  previousBalance = b;
  accountID = nextAccountNumber;
  nextAccountNumber++;
  interest = 0;
  minimumPayment = 0;
  currentBalance = 0;}

  public CreditCard(int a, double b){
  previousBalance = b;
  accountID = a;
  nextAccountNumber ++;
  interest = 0;
  minimumPayment = 0;
  currentBalance = 0;}      

  public void setInterest(double i){
  interest = i;}

  public double getInterest(){
  return interest;}

  public void setnextAccountNumber(int a){
  nextAccountNumber = a;}

  public int getnextAccountNumber(){
  return nextAccountNumber;}

  public void setaccountId(int acct){
  accountID = acct; }

  public int getaccountId(){
  return accountID;}

  public void setpreviousBalance(double p){
  previousBalance = p;}

  public double getpreviousBalance(){
  return previousBalance;}

  public void setminimumPayment(double pm){
  minimumPayment = pm;}

  public double getminimumPayment(){
  return minimumPayment;}

  public void setcurrentBalance(double cb){
  currentBalance = cb; }

  public double getcurrentBalance (){
  return currentBalance; }



  public void calculateStatement(){
  if (previousBalance <= 1000){
        interest = previousBalance* 0.015;}

  else { 
       interest = 15+(previousBalance - 1000)*0.01;}

  currentBalance = previousBalance + interest;

  if (currentBalance < 10){
        minimumPayment = currentBalance;}

  else  {minimumPayment = currentBalance * .10; }

  }

  public void printStatement(){

  String string1 = String.format ("Your old account balance  S%4.2f",previousBalance);      
  String string2 = String.format ("Your current interest $%3.2f",interest);
  String string3 = String.format ("Your new account balance $%3.2f",currentBalance);                  
  String string4 = String.format ("Your minimum payment $%4.2f",minimumPayment);                 


  System.out.println(string1);

  System.out.println(string2);

  System.out.println(string3);

  System.out.println(string4);
  }




 }

Answer 1

如果查看错误中的第一句，您可以看到您正在运行不支持的类版本。只是更新java，你应该好好去！

NetBeans中出现“不支持的major.minor版本51.0”错误？

1 个答案: