[英]When Trying to Run Code, I get a “Does Not Have Main Method Error”
我對Java還是很陌生,在我的課程中沒有學到很多東西。 每次我嘗試運行代碼時,都會被告知我沒有主要方法。 但是,我認為public void main(String [] args){聲明了main方法,它位於代碼的底部。 任何人都可以幫助修改代碼以使其運行嗎?
package Java2;
import java.util.Date;
public class tenpoint01 {
public class Time {
private int hour;
private int minute;
private int second;
public Time() {
this(System.currentTimeMillis());
}
public Time(long elapsed) {
Date date = new Date(elapsed);
this.hour = date.getHours();
this.minute = date.getMinutes();
this.second = date.getSeconds();
}
public Time(int hour, int minute, int second) {
this.hour = hour;
this.minute = minute;
this.second = second;
}
private void setTime(long elapsedTime) {
Date date = new Date(elapsedTime);
this.hour = date.getHours();
this.minute = date.getMinutes();
this.second = date.getSeconds();
}
public int getHour() {
return hour;
}
public int getMinute() {
return minute;
}
public int getSecond() {
return second;
}
@Override
public String toString() {
return hour + ":" + minute + ":" + second;
}
/**
* @param args the command line arguments
*/
public void main(String[] args) {
Time time = new Time();
Time time2 = new Time(555550000);
System.out.println(time);
System.out.println(time2);
}
}
}
更改
public void main(String[] args) {
至
public static void main(String[] args) {
導致
package java2;
import java.util.Date;
public class tenpoint01 {
public class Time {
private int hour;
private int minute;
private int second;
public Time() {
this(System.currentTimeMillis());
}
public Time(long elapsed) {
Date date = new Date(elapsed);
this.hour = date.getHours();
this.minute = date.getMinutes();
this.second = date.getSeconds();
}
public Time(int hour, int minute, int second) {
this.hour = hour;
this.minute = minute;
this.second = second;
}
private void setTime(long elapsedTime) {
Date date = new Date(elapsedTime);
this.hour = date.getHours();
this.minute = date.getMinutes();
this.second = date.getSeconds();
}
public int getHour() {
return hour;
}
public int getMinute() {
return minute;
}
public int getSecond() {
return second;
}
@Override
public String toString() {
return hour + ":" + minute + ":" + second;
}
/**
* @param args the command line arguments
*/
public void main(String[] args) {
Time time = new Time();
Time time2 = new Time(555550000);
System.out.println(time);
System.out.println(time2);
}
}
}
運行上面的結果
16
4
4
4
4
0
蜜蜂印刷
這應該做
如果缺少static
關鍵字,則main方法的簽名不正確,main方法應為:
public static void main(String[] args) {
^^^^^^
// your code here
}
因為您正在使用Netbeans(現在很智能),所以您只需鍵入public
並按Ctrl + Enter ,就可以看到主要方法。 或只鍵入psvm
然后鍵入tab ,有關更多詳細信息,請轉到此處:
您應該在主要方法中添加“靜態”關鍵字
要執行您當前擁有的內容,應該是:
public static void main(String[] args) {
Time time = new Time();
Time time2 = new Time(555550000);
System.out.println(time);
System.out.println(time2);
}
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