for (int i = 1; i <= n; i++) {
            for (int j = 1; j <= m; j++) {
                vector[i][j] = Rand.nextInt(vector_max - vector_min + 1) + vector_min;
                jTextArea1.append(Integer.toString(vector[i][j]) + "  ");
            }
            jTextArea1.append("\n");
        }
        int jmax = 0,imax = 0,i,j;
        max = vector_min;
        for (i = 1; i <= n; i++) {
            for (j = 1; j <= m; j++) {
                if (max < vector[i][j]) {
                    max = vector[i][j];
                    imax = i;
                    jmax = j;
                }
            }
        }
            s = 0;
            //int imax, jmax;
            for (i = imax - 1; i <= imax + 1; i++){
                for (j = jmax - 1; j <= jmax + 1; j++){
                    if ((i > 0) && (i <= n) && (j > 0) && (j <= m) && !((i == imax) && (j == jmax))){
                    s = s + vector[i][j];
                }
                    
                }

Exception in thread "AWT-EventQueue-0" java.lang.ArrayIndexOutOfBoundsException: 5
    at luch71.Luch71.jButton1ActionPerformed(Luch71.java:210)
    at luch71.Luch71.access$400(Luch71.java:16)
    at luch71.Luch71$5.actionPerformed(Luch71.java:84)
    at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2022)
    at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2346)
    at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
    at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
    at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252)
    at java.awt.Component.processMouseEvent(Component.java:6525)
    at javax.swing.JComponent.processMouseEvent(JComponent.java:3321)
    at java.awt.Component.processEvent(Component.java:6290)
    at java.awt.Container.processEvent(Container.java:2234)
    at java.awt.Component.dispatchEventImpl(Component.java:4881)
    at java.awt.Container.dispatchEventImpl(Container.java:2292)
    at java.awt.Component.dispatchEvent(Component.java:4703)
    at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4898)
    at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4533)
    at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4462)
    at java.awt.Container.dispatchEventImpl(Container.java:2278)
    at java.awt.Window.dispatchEventImpl(Window.java:2739)
    at java.awt.Component.dispatchEvent(Component.java:4703)
    at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:746)
    at java.awt.EventQueue.access$400(EventQueue.java:97)
    at java.awt.EventQueue$3.run(EventQueue.java:697)
    at java.awt.EventQueue$3.run(EventQueue.java:691)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:75)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:86)
    at java.awt.EventQueue$4.run(EventQueue.java:719)
    at java.awt.EventQueue$4.run(EventQueue.java:717)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:75)
    at java.awt.EventQueue.dispatchEvent(EventQueue.java:716)
    at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
    at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
    at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
    at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)

vector[i][j] = Rand.nextInt(vector_max - vector_min + 1) + vector_min;

 int vector[][] = new int[n][m];
        Random Rand = new Random();
        jTextArea1.append("Массив:" + "\n");
        for (int i = 0; i < n; i++) {
            for (int j = 0; j < m; j++) {
                vector[i][j] = Rand.nextInt(vector_max - vector_min + 1) + vector_min;
                jTextArea1.append(Integer.toString(vector[i][j]) + "  ");
            }
            jTextArea1.append("\n");
        }
        int jmax = 0,imax = 0,i,j;
        max = vector_min;
        for (i = 0; i < n; i++) {
            for (j = 0; j < m; j++) {
                if (max < vector[i][j]) {
                    max = vector[i][j];
                    imax = i;
                    jmax = j;
                }
            }
        }
            s = 0;
            //int imax, jmax;
            for (i = imax - 1; i <= imax + 1; i++){
                for (j = jmax - 1; j <= jmax + 1; j++){
                    if ((i >= 0) && (i < n) && (j >= 0) && (j < m) && !((i == imax) && (j == jmax))){
                    s = s + vector[i][j];
                }
                    
                }