小编A K*_*A K的帖子

当我编译这段代码时:

interface Rideable {
    String getGait();
}

public class Camel implements Rideable {
    int x = 2;

    public static void main(String[] args) {
        new Camel().go(8);
    }

    void go(int speed) {
        System.out.println((++speed * x++) 
        + this.getGait());
    }

    String getGait() {
        return " mph, lope";
    }
}

我收到以下错误:

Camel.java:13: error: getGait() in Camel cannot implement getGait() in Rideable
String getGait() {
       ^
  attempting to assign weaker access privileges; was public
1 error

如何在接口中声明的getGait方法被公开？

我正在尝试循环包含其他数组的数组,这些数组由带空格的字符串组成.问题是我似乎无法保留字符串中的间距.如果我将IFS更改为\n,则将带有空格的字符串分成多个项目,或者如果我将IFS保持不变,则将数组的所有元素视为1项,这里是一些示例代码:

#!/bin/sh
low1=("AA  QQ" "BB  LL")
low2=("CC" "DD")
low3=("EE" "FF")
high=(low1 low2 low3)

for high_item in ${high[@]}
do
   eval arrayz=\${$high_item[@]}
   #IFS=$'\n'
   for item in $arrayz
   do
      echo $item
   done
done

输出:

AA
QQ
BB
LL
CC
DD
EE
FF

正如您所看到的,"AA QQ"和"BB LL"元素已被拆分.

如果我取消注释设置IFS为的行,\n我将获得以下内容:

AA QQ BB LL
CC DD
EE FF

现在"AA QQ"和"BB LL"连接起来了!

无论如何,我可以保留这些元素,就像它们原始的一样......我需要输出看起来像这样:

AA QQ
BB LL
CC 
DD
EE 
FF

我有以下文件:

FILE1.TXT

###################################################
Dump stat Title information for 'ssummary' view
###################################################
Tab=> 'Instance' Title=> {text {Total instances: 7831}}
Tab=> 'Device' Title=> {text {Total spice devices: 256}}
Tab=> 'Memory' Title=> {text {Total memory allocated: 962192 kB}}
Tab=> 'Cpu' Title=> {text {Total cumulative CPU time: 9030 ms}}

FILE2.TXT

###################################################
Dump stat Title information for 'ssummary' view
###################################################
Tab=> 'Instance' Title=> {text {Total instances: 7831}}
Tab=> 'Device' Title=> {text {Total spice devices: 256}}
Tab=> 'Memory' Title=> {text {Total memory allocated: 9621932 kB}}
Tab=> …

我在官方java教程中写了一个简单的"在多维数组中查找数字".这是教程中包含的代码:

class LabeledBreak {
    public static void main(String[] args) {
        int [][] numbers = {
            {22, 34, 675, 23, 23},
            {34, 76, 98, 23, 11},
            {65, 234, 87, 23, 76}
        };

        int searchFor = 123;
        boolean found = false;
        int i;
        int j = 0;  // <-- this line

search:
        for (i = 0; i < numbers.length; i++) {
               for (j = 0; j < numbers[i].length; j++) {
                if (searchFor == numbers[i][j]) {
                    found = true;
                    break search;
                }
               } …

在下面的代码中,如果我将String名称保持为未初始化,则会出现编译错误,但是char初始化没有问题未被初始化.为什么这种行为有所不同？

class Demo {
    public static void main(String[] args) {
        char initial;
        String name;
        for (String input: args) {
            name += input;
            initial = input.charAt(0);
            System.out.print(initial + " ");
        }
    }

#! /bin/sh
a1=260
a2=9150
echo "$a1 * 100 / $a2" | bc

输出是

2

它应该在哪里

2.8415

虽然我正在使用,为什么精度会丢失bc？

如果我尝试在声明语句以外的语句上使用大括号初始化数组,为什么会出现编译错误

class Demo {
    public static void main(String[] args) {
        String[] myName;
            myName = {"AA", "BB", "CC"};
        for(String s: myName) {
            System.out.print(s + " ");
        }
    }
}

只在声明语句中使用大括号初始化有什么意义？

demo.java:4: error: illegal start of expression
                myName = {"AA", "BB", "CC"};
                         ^
demo.java:4: error: not a statement
                myName = {"AA", "BB", "CC"};
                          ^
demo.java:4: error: ';' expected
                myName = {"AA", "BB", "CC"};
                              ^
demo.java:5: error: illegal start of type
                for(String s: myName) {
                ^
demo.java:5: error: ')' expected
                for(String s: myName) …