Use StringBuilder instead of StringBuffer

se/sics/mspsim/debug/StabFile.java

@@ -130,7 +130,7 @@ public class StabFile {
     }
 
     public String toString() {
-        StringBuffer sb = new StringBuffer();
+        StringBuilder sb = new StringBuilder();
         sb.append("File: " + path + file + " starts at: " + startAddress + "\n");
         for (int i = 0; i < functions.size(); i++) {
             sb.append("  ").append(functions.get(i)).append("\n");

se/sics/mspsim/debug/StabFunction.java

@@ -21,7 +21,7 @@ public class StabFunction {
     }
     
     public String toString() {
-        StringBuffer sb = new StringBuffer();
+        StringBuilder sb = new StringBuilder();
         sb.append("Function: " + name);
         if (params != null) {
             sb.append("(");

se/sics/mspsim/extutil/highlight/LineNumberedBorder.java

@@ -264,7 +264,7 @@ public class LineNumberedBorder extends AbstractBorder {
    * @return the line number for drawing
    */
   private static String padLabel(int lineNumber, int length, boolean addSpace) {
-    StringBuffer buffer = new StringBuffer();
+    StringBuilder buffer = new StringBuilder();
     buffer.append(lineNumber);
     for (int count = (length - buffer.length()); count > 0; count--) {
       buffer.insert(0, ' ');

se/sics/mspsim/util/DotDiagram.java

@@ -180,7 +180,7 @@ public class DotDiagram extends JComponent {
 //       names = new String[diagrams];
 //     }
 //     names[index] = name;
-//     StringBuffer sb = new StringBuffer();
+//     StringBuilder sb = new StringBuilder();
 //     for (int i = 0, n = names.length; i < n; i++) {
 //       // Setup JLables...
 //     }

se/sics/mspsim/util/GDBStubs.java

@@ -201,7 +201,7 @@ public class GDBStubs implements Runnable {
 
     public static String stringToHex(String base)
     {
-        StringBuffer buffer = new StringBuffer();
+        StringBuilder buffer = new StringBuilder();
         int intValue;
         for(int x = 0; x < base.length(); x++)
         {