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CharSequence与String

当然,一个接口不能直接实例化,它需要一个实现来实例化一个变量:在这里,charSequence被一个String实例化。 差异与共性我们来比较一下CharSequence和String的差异和共性。它们都位于同一个名为java.lang的包中。但CharSequence是一个接口,String是一个具体的类。 CharSequence与String都能用于定义字符串。但CharSequence的值是可读可写序列,而String的值是只读序列,即String类是不可变的。 +(objinstanceofString));System.out.println(Is obj a CharSequence? +(strinstanceofString));System.out.println(Is str a CharSequence?

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万能的dialog库(包括类似popwindow效果)

(5)Appcompat-v7的AlertDialog1)buildMdAlert( CharSequence title, CharSequence msg, MyDialogListener listener 2)buildMdSingleChoose( CharSequence title, int defaultChosen, CharSequence words, List selectedIndexs (6)IOS风格(含按下效果)1)buildIosAlert( CharSequence title, CharSequence msg, MyDialogListener listener)? 2)buildIosAlertVertical( CharSequence title, CharSequence msg, MyDialogListener listener)? 3)buildNormalInput( CharSequence title, CharSequence hint1,          CharSequence hint2,CharSequence

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    isEmpty 和 isBlank 的用法区别,居然一半的人答不上来.....

    . * It no longer trims the CharSequence. * That functionality is available in isBlank(). * * @param cs the CharSequence to check, may be null * @return {@code true} if the CharSequence is empty or null * isEmpty()public static boolean isNotEmpty(final CharSequence cs) { return ! isBlank(String) to isBlank(CharSequence) *public static boolean isBlank(final CharSequence cs) { int isBlank();public static boolean isNotBlank(final CharSequence cs) { return !

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    isEmpty 和 isBlank 的用法区别,你都知道吗?

    . * It no longer trims the CharSequence. * That functionality is available in isBlank(). * * @param cs the CharSequence to check, may be null * @return {@code true} if the CharSequence is empty or null * isEmpty()public static boolean isNotEmpty(final CharSequence cs) { return ! isBlank(String) to isBlank(CharSequence) *public static boolean isBlank(final CharSequence cs) { int isBlank();public static boolean isNotBlank(final CharSequence cs) { return !

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    读源码Apache-commons-la

    ----1.StringUtils工具类的一些方法isEmpty(CharSequence)判断字符序列是否为null,或者长度为0isBlank(CharSequence)判读字符序列是否为null, 或者长度为0,或者为空字符trim(String)两种去除字符串前后空字符方法,各自有不同实现的    重载方法strip(String)equals(CharSequence, CharSequence )比较连个字符序列indexOf(CharSequence, int)字符串自身方法的包装,调用    CharSequenceUtils类中的方法lastIndexOf(CharSequence, int )contains(CharSequence, int)indexOfAny(CharSequence, char...)返回第二个参数中任意字符在第一个参数字符序列中存在的第一个下标containsAny ,  CharSequence)字符串相似度startsWith(CharSequence, CharSequence)指定字符串是否以第二个参数字符序列结束endsWith(CharSequence,

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    Kotlin利用Regex如何构建正则表达式详解

    函数名称 功能说明 matches(input: CharSequence): Boolean 输入字符串全部匹配 containsMatchIn(input: CharSequence): Boolean 输入字符串至少有一个匹配 matchEntire(input: CharSequence): MatchResult? 的内容 replace(input: CharSequence, transform: (MatchResult) – CharSequence): String 把输入字符串中匹配到的值,用函数 transform 映射之后的新值替换 find(input: CharSequence, startIndex: Int = 0): MatchResult? 返回输入字符串中第一个匹配的值 findAll(input: CharSequence, startIndex: Int = 0): Sequence

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    Android RecyclerView添加搜索过滤器

    public Filter getFilter() { return new Filter() { @Override protected FilterResults performFiltering(CharSequence charSequence) { String charString = charSequence.toString(); if (charString.isEmpty()) { mFilterList filterResults.values = mFilterList; return filterResults; } @Override protected void publishResults(CharSequence charSequence) { String charString = charSequence.toString(); if (charString.isEmpty()) { 没有过滤的内容,则使用源数据 sequence, int i, int i1, int i2) { } @Override public void onTextChanged(CharSequence sequence, int

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    String及StringTable(五):java8的新工具类StringJoiner

    ) * @see java.util.stream.Collectors#joining(CharSequence, CharSequence, CharSequence) * @since 1.8*public StringJoiner已经被Collectors引用,在Stream处理中,我们可以类似这样使用: * java.util.stream.Collectors#joining(CharSequence ) * java.util.stream.Collectors#joining(CharSequence, CharSequence, CharSequence)主要的成员变量有5个,分别是String , , ); }和另外一个提供了前后缀的: public StringJoiner(CharSequence delimiter, CharSequence prefix, CharSequence suffix 3.3 add public StringJoiner add(CharSequence newElement) { prepareBuilder().append(newElement); return

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    Kotlin CallBack 如何更具 Kt 风味

    Kotlin binding.etLoginName.addTextChangedListener(object: TextWatcher{ override fun beforeTextChanged(s: CharSequence , start: Int, count: Int, after: Int) { TODO(Not yet implemented) } override fun onTextChanged(s: CharSequence , Int, Int, Int) -> Unittypealias _onTextChanged = (CharSequence? invoke(s, start, count, after) } override fun onTextChanged(s: CharSequence? invoke(s) } })}最后我们可以在页面这样调用了binding.etPassword.textChangedListener { onTextChanged { charSequence, i

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    StringUtils常用方法

    StingUtils判空的方法主要如下:boolean isBlank(CharSequence cs) :检查CharSequence是否为空(“”),仅null或空白。 boolean isEmpty(CharSequence cs):检查CharSequence是否为空(“”)或null。 boolean isNotBlank(CharSequence cs):检查CharSequence是否不为空(“”),不为null和仅空白。 boolean isNotEmpty(CharSequence cs):检查CharSequence是否不为空(“”)并且不为null。 * boolean isWhitespace(CharSequence cs):检查CharSequence是否仅包含空格。

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    程序正在监听你的一举一动?

    addTextChangedListener();eNumber.addTextChangedListener(new TextWatcher(){ @Override public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) { } @Override public void onTextChanged(CharSequence s, int i, 接下来给大家附上部分源码:eNumber.addTextChangedListener(new TextWatcher(){ @Override public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) { } @Override public void onTextChanged(CharSequence s, int i, charSequence, int i, int i1, int i2) { } @Override public void onTextChanged(CharSequence charSequence

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    Edittext监听动态改变

    输入框限制输入字数         editText.addTextChangedListener(new TextWatcher() {             private CharSequence             private int selectionEnd ;             @Override             public void beforeTextChanged(CharSequence                 temp = s;             }             @Override             public void onTextChanged(CharSequence filters = new InputFilter.LengthFilter(Constant.TEXT_MAX) {             @Override             public CharSequence filter(CharSequence source, int start, int end,                     Spanned dest, int dstart, int dend

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    java8实战:使用流收集数据之toList、joining、groupBy(多字段分组)

    1public static Collector joining()2public static Collector joining(CharSequence delimiter)3public static Collector joining(CharSequence delimiter,4 CharSequence prefix, CharSequence suffix)2.1 joining1public 2.2 joining(CharSequence delimiter) 1public static Collector joining(CharSequence delimiter) { 2 return joining(delimiter, , ); 3} 4public static Collector joining(CharSequence delimiter, 5 CharSequence prefix , 6 CharSequence suffix) { 7 return new CollectorImpl( 8 () -> new StringJoiner(delimiter, prefix, suffix

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    springboot+security 内存中读取账号密码 自定义加密规则

    .; ** * 加密 * @param charSequence 需要加密的密码 * @return * @Override public String encode(CharSequence charSequence ) { charSequence = charSequence + SALT; MessageDigest md5 = null; try { md5 = MessageDigest.getInstance hexValue.append(Integer.toHexString(val)); } return hexValue.toString(); } ** * 判断加密后的密码是否一致 * @param charSequence 需要加密的密码 * @param password 数据库中加密后的密码,权限框架会直接传入 * @return * @Override public boolean matches(CharSequence charSequence, String password) { String pwd=encode(charSequence); if(pwd.equals(password)){ return true

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    如何利用Kotlin实现极简回调

    s, int start, int count, int after) { } @Override public void onTextChanged(CharSequence s, int start = null private var onTextChanged: ((CharSequence?, Int, Int, Int) - Unit)? = null override fun beforeTextChanged(s: CharSequence? invoke(s, start, count, after) } override fun onTextChanged(s: CharSequence? invoke(s) } fun beforeTextChanged(listener: (CharSequence?

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    commons-lang3工具类学习(三)

    ., 4) = ab.fappendIfMissing(String str, CharSequence suffix, CharSequence... suffixes) 如果str不是以任何suffixes suffix, CharSequence... suffixes) 同上 不区分大小写capitalize(String str) 将字符串第一个字符大写并返回center(String str, int cs, CharSequence... searchCharSequences) 检查字符串中是否包含任一字符,返回booleanStringUtils.containsAny(null, *) = (null, (CharSequence {}) = StringUtils.getCommonPrefix(new String {null, null}) = StringUtils.getCommonPrefix prefix, CharSequence... prefixes) 在字符串最左边插入指定字符,如果已存在,将不插入,返回一个stringStringUtils.prependIfMissing(null

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    Android项目实战(五):TextView自适应大小

    R.id.input)).addTextChangedListener(new TextWatcher() {23 @Override24 public void beforeTextChanged(CharSequence charSequence, int i, int i2, int i3) {25 do nothing26 }27 28 @Override29 public void onTextChanged( CharSequence charSequence, int i, int i2, int i3) {30 mOutput.setText(charSequence);31 mAutofitOutput.setText (charSequence);32 }33 34 @Override35 public void afterTextChanged(Editable editable) {36 do nothing37

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    Android 多语言动态更新方案探索

    checkTextRepairOn()) { return mAppResources.getText(resId); } else { CharSequence charSequence; try { (TAG, getText res from app --- + charSequence); } else { charSequence = mResPackResources.getText(plugId ); printLog(TAG, getText res from plug --- + charSequence); } } catch (Throwable e) { charSequence = mAppResources.getText(resId); if (BuildConfig.DEBUG) { e.printStackTrace(); } } return charSequence; } } @NonNull @Override public CharSequence getStringArray(int resId) throws NotFoundException { .....

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    KotlinTips asType 快捷转换

    { return if (this is T) { this } else { null } } fun testAsType(charSequence: CharSequence?) { 书写不流畅,需要回到开始出增加() (charSequence as? String)?.length 一气呵成书写 charSequence?.asType()?.

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    java8实战:使用流收集数据之toList、joining、groupBy(多字段分组)

    1public static Collector joining()2public static Collector joining(CharSequence delimiter)3public static Collector joining(CharSequence delimiter,4 CharSequence prefix, CharSequence suffix)2.1 joining1public 2.2 joining(CharSequence delimiter) 1public static Collector joining(CharSequence delimiter) { 2 return joining(delimiter, , ); 3} 4public static Collector joining(CharSequence delimiter, 5 CharSequence prefix , 6 CharSequence suffix) { 7 return new CollectorImpl( 8 () -> new StringJoiner(delimiter, prefix, suffix

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