java: 不兼容的类型: java.lang.String无法转换为java.io.StringReader
时间: 2024-05-07 16:20:32 浏览: 139
这个错误通常出现在你试图将一个字符串传递给需要一个字符流的方法或API时。要解决这个问题,你需要创建一个StringReader对象,将字符串传递给它,然后将该对象传递给方法或API。
例如,如果你有一个需要一个字符流的方法:
```java
public void process(Reader reader) {
// process the input stream
}
```
而你想传递一个字符串作为输入。你可以这样做:
```java
String input = "hello world";
StringReader reader = new StringReader(input);
process(reader);
```
这将创建一个StringReader对象,将输入字符串传递给它,然后将该对象传递给process方法。这样就可以避免上述错误了。
相关问题
能将以下kotlin代码转换成java吗 package com.blog.demo41 import android.os.Bundle import android.util.Log import android.view.View import android.widget.Button import com.blog.AbstractLoggerActivity import com.blog.R import com.blog.demo39.TAG import com.blog.support.logger.Logger import java.io.BufferedReader import java.io.IOException import java.io.InputStream import java.io.InputStreamReader class StrokeOrderActivity : AbstractLoggerActivity() { var svgSix: String? = null var svgOne: String? = null lateinit var strokeOrderView1: StrokeOrderView lateinit var strokeOrderView2: StrokeOrderView override fun onCreate(savedInstanceState: Bundle?) { super.onCreate(savedInstanceState) setContentView(R.layout.activity_stroke_order_layout) initLoggerLayout() strokeOrderView1 = findViewById(R.id.stroke_order_view1) strokeOrderView2 = findViewById(R.id.stroke_order_view2) findViewById<Button>(R.id.btn_load_svg_six).setOnClickListener { val name = "张.json" // 需要将 svg.json 放在 assets 或特定路径下 svgSix = loadSvgFromAssets(name) showTips("加载$name ->$svgSix") svgSix?.let { showTips("start draw -> $name") strokeOrderView1.setStrokesBySvg(it) } } findViewById<Button>(R.id.btn_load_svg_one).setOnClickListener { val name = "張.json" svgOne = loadSvgFromAssets(name) showTips("加载$name ->$svgOne") svgOne?.let { showTips("start draw -> $name") strokeOrderView2.setStrokesBySvg(it) } } } private fun loadSvgFromAssets(name: String): String? { try { assets.list("data")?.let { for (s in it) { if (name == s) { Log.d("zuo", "svgName-> $s") return loadSvgJson("data/$s") ?: "NULL" } } } } catch (e: IOException) { e.printStackTrace() } return null } private fun loadSvgJson(file: String): String? { var reader: BufferedReader? = null var inputStreamReader: InputStreamReader? = null try { val inputStream: InputStream = assets.open(file) inputStreamReader = InputStreamReader(inputStream) reader = BufferedReader(inputStreamReader) var line: String? val entity = java.lang.StringBuilder() while (reader.readLine().also { line = it } != null) { entity.append(line) } return entity.toString() } catch (e: java.lang.Exception) { e.printStackTrace() } finally { try { inputStreamReader?.close() reader?.close() } catch (e: IOException) { e.printStackTrace() } } return null } private fun showTips(str: String) { Log.d(TAG, str) Logger.i(TAG, str) } }
可以,以下是转换后的Java代码:
```java
package com.blog.demo41;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import androidx.appcompat.app.AppCompatActivity;
import com.blog.R;
import com.blog.support.logger.Logger;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
public class StrokeOrderActivity extends AppCompatActivity {
private String svgSix = null;
private String svgOne = null;
private StrokeOrderView strokeOrderView1;
private StrokeOrderView strokeOrderView2;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_stroke_order_layout);
initLoggerLayout();
strokeOrderView1 = findViewById(R.id.stroke_order_view1);
strokeOrderView2 = findViewById(R.id.stroke_order_view2);
findViewById(R.id.btn_load_svg_six).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
String name = "张.json"; // 需要将 svg.json 放在 assets 或特定路径下
svgSix = loadSvgFromAssets(name);
showTips("加载" + name + " ->" + svgSix);
if (svgSix != null) {
showTips("start draw -> " + name);
strokeOrderView1.setStrokesBySvg(svgSix);
}
}
});
findViewById(R.id.btn_load_svg_one).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
String name = "張.json";
svgOne = loadSvgFromAssets(name);
showTips("加载" + name + " ->" + svgOne);
if (svgOne != null) {
showTips("start draw -> " + name);
strokeOrderView2.setStrokesBySvg(svgOne);
}
}
});
}
private String loadSvgFromAssets(String name) {
try {
String[] list = getAssets().list("data");
if (list != null) {
for (String s : list) {
if (name.equals(s)) {
Log.d("zuo", "svgName-> " + s);
return loadSvgJson("data/" + s);
}
}
}
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
private String loadSvgJson(String file) {
BufferedReader reader = null;
InputStreamReader inputStreamReader = null;
try {
InputStream inputStream = getAssets().open(file);
inputStreamReader = new InputStreamReader(inputStream);
reader = new BufferedReader(inputStreamReader);
String line;
StringBuilder entity = new StringBuilder();
while ((line = reader.readLine()) != null) {
entity.append(line);
}
return entity.toString();
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
if (inputStreamReader != null) {
inputStreamReader.close();
}
if (reader != null) {
reader.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
return null;
}
private void showTips(String str) {
Log.d("TAG", str);
Logger.i("TAG", str);
}
}
```
Exception in thread "main" java.lang.Error: Unresolved compilation problems: The method readLine() is undefined for the type FileInputStream The method write(int) in the type FileOutputStream is not applicable for the arguments (String) at java_text.text5.main(text5.java:18)这是什么问题
这个错误提示是因为代码中使用了 `readLine()` 方法,但是 `FileInputStream` 类并没有提供 `readLine()` 方法,所以编译器无法识别该方法。
另外一个错误提示是因为代码中使用了 `write()` 方法写入字符串,而 `FileOutputStream` 类的 `write()` 方法只能写入字节类型的数据,所以编译器无法识别该方法。
要解决这些问题,可以使用 `BufferedReader` 类来替代 `FileInputStream`,使用 `BufferedWriter` 类来替代 `FileOutputStream`,这些类提供了更方便的读写方法,能够更好地处理文本类型的数据。代码示例:
```
import java.io.*;
public class text5 {
public static void main(String[] args) {
File inFile = new File("Source.txt");
File outFile = new File("dost.txt");
String line;
int num = 1;
try (BufferedReader reader = new BufferedReader(new FileReader(inFile));
BufferedWriter writer = new BufferedWriter(new FileWriter(outFile))) {
while ((line = reader.readLine()) != null) {
writer.write(num + ":" + line + "\n");
num++;
}
} catch (IOException e) {
e.printStackTrace();
}
}
}
```
在这个示例代码中,使用了 `BufferedReader` 类来读取文本文件,使用 `BufferedWriter` 类来写入文本文件,这样就可以更好地处理文本类型的数据,并且代码更加简洁易懂。
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