Add more functions

src/main/java/SBC/ProcessorStatus.java

@@ -0,0 +1,45 @@
+package SBC;
+
+public class ProcessorStatus {
+    public String name;
+    public int user;
+    public int nice;
+    public int system;
+    public int idle;
+    public int iowait;
+    public int irq;
+    public int softirq;
+    public int steal;
+    public int guest;
+    public int guest_nice;
+
+    /**
+     * Calculate total CPU time
+     * @return Total CPU time
+     */
+    public int total_time(){
+        return user + nice + system + idle + iowait + irq + softirq + steal + guest + guest_nice;
+    }
+
+    /**
+     * Calculate idle CPU time
+     * @return Idle CPU time
+     */
+    public int idle_time(){
+        return idle + iowait;
+    }
+
+    /**
+     * Calculate CPU usage percentage
+     * @param prev Previous CPU information
+     * @return CPU usage percentage 0 - 100
+     */
+    public int cpu_usage(ProcessorStatus prev){
+        if (prev!=null){
+            int total_diff = total_time() - prev.total_time();
+            int idle_diff = idle_time() - prev.idle_time();
+            return (int)(100.0 * (total_diff - idle_diff) / total_diff);
+        }
+        return 0;
+    }
+}