java732的簡單介紹

本文目錄一覽：

1、java編寫一個方法找出一個數組裡所有數組元素的排列例：輸入{7,2,3} 返回{723,732,327,372,237,273}
2、tomcat啟動時報的錯誤
3、我的世界打開程序時報錯。
4、Tomcat 啟動，報如下錯誤？

java編寫一個方法找出一個數組裡所有數組元素的排列例：輸入{7,2,3} 返回{723,732,327,372,237,273}

import java.util.Arrays;

/**

* 獲得數組全排列的一個實現算法

public class Test {

static String[] array = { “7”, “2”, “3” };

public static void main(String[] args) {

getAllOrder(0, array.length – 1);

}

public static void getAllOrder(int begin, int end) {

if (begin == end) {

check();

} else {

for (int i = begin; i = end; i++) {

// 交換數據

swap(begin, i);

getAllOrder(begin + 1, end);

swap(i, begin);

}

public static void swap(int from, int to) {

// 這裡應該加上各種防止無效交換的情況

// 比如位置相同，或者2個位置的數據相同

if (from == to) {

return;

}

String tmp = array[from];

array[from] = array[to];

array[to] = tmp;

}

public static void check() {

// 排列拿到了，可以進行你的判斷了。

System.out.println(Arrays.toString(array));

}

記得採納！

tomcat啟動時報的錯誤

你把apache-tomcat-6.0.37\conf\Catalina\localhost下的文件，除了host-manager.xml和manager.xml之外的全部刪了試試

我的世界打開程序時報錯。

這是遊戲文本化，是你的設置不對。打開遊戲還沒開始的界面。打開設置最大內存旁邊有個最佳內存點一下就可以玩了，如果照樣不能玩沒關係輸入比最佳內存小一倍的數字就行了

Tomcat 啟動，報如下錯誤？

這個問題有很多原因，我遇到的一個場景如下，先給解決辦法，再分析

解決辦法：

仔細檢查會發現，會發現有這個一個錯誤提示：

Multiple markers at this line

– The type org.apache.commons.pool2.impl.GenericObjectPoolConfig cannot be resolved. It is indirectly referenced from

required .class files

這個提示是包衝突，看到這個會想到maven依賴有衝突，注釋掉多餘的依賴問題則解決了（springboot 有個數據訪問的項目集成了commons.pool，我的是是pom中多加了一個commons.pool 的依賴）。

問題描述：

ContainerBase.addChild: start:

org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/datas-pre]]

at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:162)

at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:753)

at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:729)

at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:717)

at org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.java:621)

at org.apache.catalina.startup.HostConfig$DeployDescriptor.run(HostConfig.java:1835)

at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)

at java.util.concurrent.FutureTask.run(Unknown Source)

at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)

at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)

at java.lang.Thread.run(Unknown Source)

Caused by: org.apache.catalina.LifecycleException: Failed to start component [org.apache.catalina.webresources.StandardRoot@5abfde6e]

at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:162)

at org.apache.catalina.core.StandardContext.resourcesStart(StandardContext.java:4969)

at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5102)

at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)

… 10 more

Caused by: org.apache.catalina.LifecycleException: Failed to initialize component [org.apache.catalina.webresources.JarResourceSet@4b64f19e]

at org.apache.catalina.util.LifecycleBase.init(LifecycleBase.java:107)

at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:135)

at org.apache.catalina.webresources.StandardRoot.startInternal(StandardRoot.java:722)

at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:145)

… 13 more

Caused by: java.lang.IllegalArgumentException: java.util.zip.ZipException: invalid LOC header (bad signature)

at org.apache.catalina.webresources.AbstractSingleArchiveResourceSet.initInternal(AbstractSingleArchiveResourceSet.java:113)

at org.apache.catalina.util.LifecycleBase.init(LifecycleBase.java:102)

… 16 more

Caused by: java.util.zip.ZipException: invalid LOC header (bad signature)

at java.util.zip.ZipFile.read(Native Method)

at java.util.zip.ZipFile.access$1400(Unknown Source)

at java.util.zip.ZipFile$ZipFileInputStream.read(Unknown Source)

at java.util.zip.ZipFile$ZipFileInflaterInputStream.fill(Unknown Source)

at java.util.zip.InflaterInputStream.read(Unknown Source)

at sun.misc.IOUtils.readFully(Unknown Source)

at java.util.jar.JarFile.getBytes(Unknown Source)

at java.util.jar.JarFile.getManifestFromReference(Unknown Source)

at java.util.jar.JarFile.getManifest(Unknown Source)

at org.apache.catalina.webresources.AbstractSingleArchiveResourceSet.initInternal(AbstractSingleArchiveResourceSet.java:111)

… 17 more

一月 10, 2018 4:55:33 下午 org.apache.catalina.startup.HostConfig deployDescriptor

嚴重: Error deploying configuration descriptor D:\files\workspace\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\conf\Catalina\localhost\datas-pre.xml

java.lang.IllegalStateException: ContainerBase.addChild: start: org.apache.catalina.LifecycleException: Failed to start component [StandardEngine[Catalina].StandardHost[localhost].StandardContext[/datas-pre]]

at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:757)