Java如何使用字符串值作为类名与变量名生成目标代码

根据你给出的字符串变量和目标代码，我们可以通过精准文本替换或者代码层面的字符串拼接来实现需求，下面分两种场景说明：

1. 直接替换后的最终代码 #

按照你指定的映射关系逐一替换：

• CustomTextInputLayout → android1的值：TextInputLayout
• TextInputEditText → android2的值：TextInputEditText（和原变量值一致，替换后无变化）
• textInputEditTextemail → android1var的值：customTextInputLayoutemail
• customTextInputLayoutemail → android2var的值：textInputEditTextemail

替换完成的代码如下：

TextInputLayout textInputEditTextemail = null; 
TextInputEditText customTextInputLayoutemail = null; 
textInputEditTextemail = new TextInputLayout(this); 
textInputEditTextemail.setLayoutParams(new TextInputLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,ViewGroup.LayoutParams.WRAP_CONTENT)); 
customTextInputLayoutemail = new TextInputEditText(this); 
customTextInputLayoutemail.setHint(""); 
textInputEditTextemail.addView(customTextInputLayoutemail); 
textInputEditTextemail.setHelperText("min "+MIN_PASSWORD_LENGTH+" characters"); 

2. 代码层面动态生成（字符串拼接方式） #

如果是想在Java代码里通过变量动态生成这段代码，可以用字符串拼接的方式实现，示例代码如下：

String android1="TextInputLayout"; 
String android1var = "customTextInputLayoutemail"; 
String android2="TextInputEditText"; 
String android2var = "textInputEditTextemail";

// 拼接生成目标代码字符串
String generatedCode = 
    android1 + " " + android2var + " = null; " +
    android2 + " " + android1var + " = null; " +
    android2var + " = new " + android1 + "(this); " +
    android2var + ".setLayoutParams(new " + android1 + ".LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,ViewGroup.LayoutParams.WRAP_CONTENT)); " +
    android1var + " = new " + android2 + "(this); " +
    android1var + ".setHint(\"\"); " +
    android2var + ".addView(" + android1var + "); " +
    android2var + ".setHelperText(\"min \"+MIN_PASSWORD_LENGTH+\" characters\");";

// 可输出或直接使用生成的代码字符串
System.out.println(generatedCode);

这样就能完全按照你的要求完成类名和变量名的替换啦。

内容的提问来源于stack exchange，提问作者Santhosh