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jAvA改错一下代码

DefaultMutableTreeNode selectionNode=(DefaultMutableTreeNode)jt.getLastSelectedPathComponent(); String nodename=selectionNode.toString(); System.out.println(nodename); if(selectionNode.isRoot()){ model1=new DefaultTableModel(da...

帮你运行: F:\oop>javac Test05.javaF:\oop>java Test05Exception in thread "main" java.lang.NullPointerException at java.awt.Container.addImpl(Container.java:1090) at java.awt.Container.add(Container.java:410) at Test05.(Test05.j...

int和int除法,得到是整除的结果,还是int,再强转为double。如果希望得到准确的double结果,最后一行改为: return ((double)sum)/((double)numbers.length)

1.float z = 3.414;改为float z = 3;他是 2.String str1 = 'bye';改为String str1 = ”bye“;因为string是字符串不是字符,字符才用''。 3.c = "A";变量c不是字符串类型,他是字符 4.public static main(String[] args)缺少void,public static vo...

public static void select_2 ( int[] arr ){for ( int x = 0; x < arr.length - 1; x++ ){int num = arr[x];int index = x;// 仔细看,是y,不是x啊,大姐节。。。for ( int y = x + 1; y < arr.length; y++ ){if (num < arr[y]){num = arr[y];...

删除shuzu定义括号中的内容。

word.toUpperCase();只是转换,并没有改变word的值, String copyWord = word.toUpperCase();然后调用copyWord就好了

1 JAVA程序改错 1. abstract class Name { private String name; public abstract boolean isStupidName(String name) {} } 答案: 错。abstract method必须以分号结尾,且不带花括号。 2. public class Something { void doSomething () { priva...

import java.awt.BorderLayout; import java.awt.Button; import java.awt.Frame; import java.awt.GridLayout; import java.awt.Menu; import java.awt.MenuBar; import java.awt.MenuItem; import java.awt.Panel; import java.awt.TextField;...

public class MaoPao { public static void main(String[] args) { int[] num = new int[5]; int temp; // 接收用户输入五个数字 System.out.println("请输入五个数字(以空格隔开):"); try { Scanner input = new Scanner(System.in); for (i...

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