Java 在特定索引处添加到列表中
我对一些列表操作有问题。我获取用户的输入并进行搜索:如果我找到一个“=”符号,我假设前面的字符串是一个变量的名称,因此在该变量正上方的行中,我想向用户的输入添加一个新字符串(在本例中,它被称为“tempVAR”,其实并不重要)。我一直在尝试使用StringBuilder来实现这一点,但没有任何成功,因此我目前正在尝试使用ArrayList来实现这一点,但我一直无法将新元素添加到列表中。由于list.add(index,string)的工作方式,我要添加的内容右侧的元素将始终向其索引中添加+1。即使添加了随机数的字符串,是否有办法始终准确地知道我要查找的索引?这是到目前为止我的代码,如果您运行它,您将看到我的意思,而不是在变量名称上方添加“tempVAR”或“tempVar1”,它们将以错误的方式添加到一个或多个位置Java 在特定索引处添加到列表中,java,Java,我对一些列表操作有问题。我获取用户的输入并进行搜索:如果我找到一个“=”符号,我假设前面的字符串是一个变量的名称,因此在该变量正上方的行中,我想向用户的输入添加一个新字符串(在本例中,它被称为“tempVAR”,其实并不重要)。我一直在尝试使用StringBuilder来实现这一点,但没有任何成功,因此我目前正在尝试使用ArrayList来实现这一点,但我一直无法将新元素添加到列表中。由于list.add(index,string)的工作方式,我要添加的内容右侧的元素将始终向其索引中添加+1。即
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map.Entry;
public class ToTestStuff {
static List<String> referenceList = new ArrayList<String>();
public static final String SEMICOLUMN = ";";
public static final String BLANK = " ";
public static final String EMPTY = "";
public static final String LEFT_CURLY = "{";
public static final char CARRIAGE_RETURN = '\r';
public static final String CR_STRING = "CARRIAGE_RETURN_AND_NEW_LINE";
public static final char NEW_LINE = '\n';
public static void main(String[] args) {
List<String> test = new ArrayList<String>();
String x = "AGE_X";
String y = "AGE_Y";
String z = "AGE_YEARS";
String t = "P_PERIOD";
String w = "T_VALID";
referenceList.add(x);
referenceList.add(y);
referenceList.add(z);
referenceList.add(t);
referenceList.add(w);
String text2 = " if ( AGE_YEARS > 35 ) {\r\n"
+ " varX = P_PERIOD ;\r\n"
+ " }\r\n"
+ " if ( AGE_YEARS < 35 ) {\r\n"
+ " varY = T_VALID ;\r\n"
+ " varZ = AGE_Y ;\r\n"
+ " varA = AGE_X ;\r\n"
+ " }";
detectEquals(text2);
}
public static String detectEquals(String text) {
String a = null;
// text = text.trim();
// text = TestSplitting.addDelimiters(text);
String[] newString = text.split(" ");
List<String> test = Arrays.asList(newString);
StringBuilder strBuilder = new StringBuilder();
HashMap<String, List<Integer>> signs = new HashMap<String, List<Integer>>();
HashMap<String, List<Integer>> references = new HashMap<String, List<Integer>>();
HashMap<Integer, Integer> indexesOfStringAndList = new HashMap<Integer, Integer>();
List<String> testList = new ArrayList<String>();
List<Integer> lastList = new ArrayList<Integer>();
List<Integer> indexList = new ArrayList<Integer>();
List<Integer> refList = new ArrayList<Integer>();
List<String> keysList = new ArrayList<String>();
List<List> minList = new ArrayList<List>();
String previous = null;
int index = 0;
Object obj = new Object();
List<Integer> referenceValueList = new ArrayList<Integer>();
List<Integer> indexPosition = new ArrayList<Integer>();
String b = null;
int indexOfa = 0;
// System.out.println("a----> " + test);
List<String> anotherList = new ArrayList(test);
for (int i = 0; i < anotherList.size(); i++) {
a = anotherList.get(i).trim();
index = strBuilder.length();// - a.length();
// index = i;
strBuilder.append(a); // "=", 3 - if, 14 - while, 36 , "=", 15
testList.add(a);
if (a.equals("if") || a.equals("=")) {
lastList.add(i);
indexOfa = i;
indexesOfStringAndList.put(index, indexOfa);
refList.add(index);
indexPosition.add(index);
if (signs.containsKey(a)) {
signs.get(a).add(index);
} else {
signs.put(a, refList);
}
refList = new ArrayList<Integer>();
}
if (referenceList.contains(a)) {
indexList.add(index);
if (references.containsKey(a)) {
references.get(a).add(index);
} else {
references.put(a, indexList);
}
indexList = new ArrayList<Integer>();
}
}
for (String k : references.keySet()) {
keysList.add(k);
referenceValueList = references.get(k);
obj = Collections.min(referenceValueList);
int is = (Integer) obj;
ArrayList xx = new ArrayList();
xx.add(new Integer(is));
xx.add(k);
minList.add(xx);
}
for (List q : minList) {
Integer v = (Integer) q.get(0);
String ref = (String) q.get(1);
int x = closest(v, indexPosition);
int lSize = anotherList.size();
int sizeVar = lSize - test.size();
int indexOfPx = 0;
int px = 0;
if (x != 0) {
px = indexesOfStringAndList.get(x) - 1;
} else {
px = indexesOfStringAndList.get(x);
}
if (px == 0) {
System.out.println("previous when x=0 " +anotherList.get(px+sizeVar));
anotherList.add(px, "tempVar1=\r\n");
} else {
previous = anotherList.get(px + sizeVar);
System.out.println("previous is---> " + previous + " at position " + anotherList.indexOf(previous));
anotherList.add(anotherList.indexOf(previous) - 1, "\r\ntempVAR=");
}
}
strBuilder.setLength(0);
for (int j = 0; j < anotherList.size(); j++) {
b = anotherList.get(j);
strBuilder.append(b);
}
String stream = strBuilder.toString();
// stream = stream.replaceAll(CR_STRING, CARRIAGE_RETURN + EMPTY + NEW_LINE);
System.out.println("after ----> " + stream);
return stream;
}
public static int closest(int of, List<Integer> in) {
int min = Integer.MAX_VALUE;
int closest = of;
for (int v : in) {
final int diff = Math.abs(v - of);
if (diff < min) {
min = diff;
closest = v;
}
}
return closest;
}
}
import java.util.ArrayList;
导入java.util.array;
导入java.util.Collections;
导入java.util.HashMap;
导入java.util.List;
导入java.util.Map.Entry;
公共阶级的东西{
静态列表引用列表=新的ArrayList();
公共静态最终字符串半列=“;”;
公共静态最终字符串BLANK=“”;
公共静态最终字符串为空=”;
公共静态最终字符串LEFT_CURLY=“{”;
公共静态最终字符回车='\r';
公共静态最终字符串CR\u String=“回车和换行”;
公共静态最终字符新行='\n';
公共静态void main(字符串[]args){
列表测试=新建ArrayList();
String x=“AGE_x”;
字符串y=“AGE_y”;
字符串z=“年龄\年”;
字符串t=“P_期间”;
字符串w=“T\u有效”;
添加(x);
添加(y);
添加(z);
添加(t);
添加(w);
String text2=“如果(年龄>35){\r\n”
+“varX=P\u周期;\r\n”
+“}\r\n”
+“如果(年龄<35岁){\r\n”
+“varY=T\u有效;\r\n”
+“varZ=AGE_Y;\r\n”
+“varA=AGE\u X;\r\n”
+ " }";
检测质量(text2);
}
公共静态字符串检测相等(字符串文本){
字符串a=null;
//text=text.trim();
//text=testspliting.addDelimiters(text);
String[]newString=text.split(“”);
List test=Arrays.asList(新闻字符串);
StringBuilder strBuilder=新StringBuilder();
HashMap signs=新的HashMap();
HashMap references=新的HashMap();
HashMap indexesOfStringAndList=新HashMap();
List testList=new ArrayList();
List lastList=new ArrayList();
列表索引列表=新的ArrayList();
List refList=new ArrayList();
List keysList=new ArrayList();
List minList=new ArrayList();
字符串previous=null;
int指数=0;
Object obj=新对象();
List referenceValueList=新建ArrayList();
List indexPosition=new ArrayList();
字符串b=null;
int indexOfa=0;
//System.out.println(“a-->”+测试);
List anotherList=新阵列列表(测试);
for(int i=0;i”+previous+”位于“+anotherList.indexOf(previous));
anotherList.add(anotherList.indexOf(previous)-1,“\r\ntempVAR=”);
}
}
strBuilder.setLength(0);
对于(int j=0;j